BCSDLab/KOIN_API_V2
Nov 2024 – Jan 2026
15 Months active
Languages Used
JavaKotlinSQLJSONGradleYAML
Technical Skills
API DesignAPI DevelopmentAspect-Oriented Programming (AOP)AuthenticationAuthorizationBackend Development
신관규
PROFILE
신관규
Over 15 months, Soundbar91 engineered and maintained the BCSDLab/KOIN_API_V2 backend, delivering over 50 features and 20 bug fixes. They built robust APIs for admin management, timetable scheduling, club and payment systems, and notification workflows, focusing on data integrity, validation, and maintainability. Using Java, Spring Boot, and SQL, Soundbar91 refactored data models, implemented versioned APIs, and introduced advanced error handling and logging. Their work included database migrations with Flyway, Excel file processing, and integration of authentication and authorization flows. The depth of their contributions ensured scalable, reliable operations and improved developer experience across evolving business requirements and platform domains.
Overall Statistics
Feature vs Bugs
73%Features
Repository Contributions
150Total
Bugs
20
Commits
150
Features
53
Lines of code
37,987
Activity Months15
Your Network
8 people
Work History
January 2026
4 Commits • 3 Features
Jan 1, 2026January 2026 (2026-01) — Focused on expanding admin capabilities, enabling timetable features, and establishing a robust push notification workflow. Key deliverables included: enum extension to support timetable functionality, a new Push Notification API for admin-driven user communications with validation and delivery management, and Admin API enhancements with richer auth state visibility and event notifications. A critical Admin API fix (Coin Admin) was also addressed to improve reliability and consistency of authentication-related responses. These efforts deliver measurable business value: improved user engagement with timely notifications, better control for admins, and more transparent authentication state, while strengthening API reliability and documentation.
4 Commits • 3 Features
Jan 1, 2026January 2026 (2026-01) — Focused on expanding admin capabilities, enabling timetable features, and establishing a robust push notification workflow. Key deliverables included: enum extension to support timetable functionality, a new Push Notification API for admin-driven user communications with validation and delivery management, and Admin API enhancements with richer auth state visibility and event notifications. A critical Admin API fix (Coin Admin) was also addressed to improve reliability and consistency of authentication-related responses. These efforts deliver measurable business value: improved user engagement with timely notifications, better control for admins, and more transparent authentication state, while strengthening API reliability and documentation.
January 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 – BCSDLab/KOIN_API_V2 concise monthly summary focused on delivering precise error handling for duplicate reviews and improving debugging traceability across services. Key features delivered: - Enhanced Error Messaging for Duplicate Reviews: Refactored the error response to include the specific student ID and shop ID, delivering clearer feedback to users and enabling faster debugging. Major bugs fixed: - Resolved ambiguity in duplication errors by augmenting messages with identifiers, improving traceability and reducing investigation time for duplicate submission issues. Overall impact and accomplishments: - Improved debugging clarity and user feedback for a critical workflow (duplicate reviews), enabling faster issue resolution and better data integrity. - Strengthened cross-service error propagation and maintainability through structured error details and consistent messaging. Technologies/skills demonstrated: - Error handling and message design for better UX - Refactoring for clearer, traceable logs and errors - Commit traceability and alignment with issue (#2106) - Cross-service data awareness (student ID, shop ID in errors)
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 – BCSDLab/KOIN_API_V2 concise monthly summary focused on delivering precise error handling for duplicate reviews and improving debugging traceability across services. Key features delivered: - Enhanced Error Messaging for Duplicate Reviews: Refactored the error response to include the specific student ID and shop ID, delivering clearer feedback to users and enabling faster debugging. Major bugs fixed: - Resolved ambiguity in duplication errors by augmenting messages with identifiers, improving traceability and reducing investigation time for duplicate submission issues. Overall impact and accomplishments: - Improved debugging clarity and user feedback for a critical workflow (duplicate reviews), enabling faster issue resolution and better data integrity. - Strengthened cross-service error propagation and maintainability through structured error details and consistent messaging. Technologies/skills demonstrated: - Error handling and message design for better UX - Refactoring for clearer, traceable logs and errors - Commit traceability and alignment with issue (#2106) - Cross-service data awareness (student ID, shop ID in errors)
November 2025
7 Commits • 4 Features
Nov 1, 2025November 2025 monthly summary for BCSDLab/KOIN_API_V2: Implemented centralized admin action auditing, expanded shuttle bus and cooperative shop APIs with Excel parsing, standardized API response naming, updated Koreatech bus schedules, and stabilized graduation credit Excel uploads. These efforts improved governance, data integrity, API consistency, and operational scheduling across admin and transportation domains.
7 Commits • 4 Features
Nov 1, 2025November 2025 monthly summary for BCSDLab/KOIN_API_V2: Implemented centralized admin action auditing, expanded shuttle bus and cooperative shop APIs with Excel parsing, standardized API response naming, updated Koreatech bus schedules, and stabilized graduation credit Excel uploads. These efforts improved governance, data integrity, API consistency, and operational scheduling across admin and transportation domains.
November 2025
October 2025
7 Commits • 4 Features
Oct 1, 2025Summary for 2025-10 focused on delivering observable improvements, stable data-layer behavior, reliable builds, and robust data ingestion in BCSDLab/KOIN_API_V2. The month includes four major feature deliveries, plus a targeted bug fix to restore stability after refactor.
October 2025
7 Commits • 4 Features
Oct 1, 2025Summary for 2025-10 focused on delivering observable improvements, stable data-layer behavior, reliable builds, and robust data ingestion in BCSDLab/KOIN_API_V2. The month includes four major feature deliveries, plus a targeted bug fix to restore stability after refactor.
September 2025
16 Commits • 3 Features
Sep 1, 2025September 2025: Key backend releases in BCSDLab/KOIN_API_V2 delivered substantial business value across payments, orders, and platform stability. The Payment System Overhaul and Order Integration created a robust, extensible payments API with updated schemas, enhanced cancellation flows, and richer responses, enabling new payment methods and improved data consistency. The Order History, Search, and Delivery Data Enhancements delivered a new history API with filtering and improved search by shop and menu, plus richer delivery data (coordinates and shop details), improving customer support and analytics. Internal Platform Stability and Admin Logging improvements focused on admin tooling, indexing for performance, and validation adjustments to reduce errors and improve maintainability. Additional refinements included coordinate validation adjustments and temporary payment storage enhancements to support edge cases and improve resilience. These changes collectively improved transaction success rates, order traceability, and operator efficiency.
16 Commits • 3 Features
Sep 1, 2025September 2025: Key backend releases in BCSDLab/KOIN_API_V2 delivered substantial business value across payments, orders, and platform stability. The Payment System Overhaul and Order Integration created a robust, extensible payments API with updated schemas, enhanced cancellation flows, and richer responses, enabling new payment methods and improved data consistency. The Order History, Search, and Delivery Data Enhancements delivered a new history API with filtering and improved search by shop and menu, plus richer delivery data (coordinates and shop details), improving customer support and analytics. Internal Platform Stability and Admin Logging improvements focused on admin tooling, indexing for performance, and validation adjustments to reduce errors and improve maintainability. Additional refinements included coordinate validation adjustments and temporary payment storage enhancements to support edge cases and improve resilience. These changes collectively improved transaction success rates, order traceability, and operator efficiency.
September 2025
August 2025
5 Commits • 4 Features
Aug 1, 2025Monthly performance summary for 2025-08 focusing on delivering customer-facing API capabilities, QA-driven reliability improvements, and data readiness for the upcoming term. Key features and repository migrations implemented, with measurable business value through improved data accessibility, testing efficiency, and accurate operation schedules.
August 2025
5 Commits • 4 Features
Aug 1, 2025Monthly performance summary for 2025-08 focusing on delivering customer-facing API capabilities, QA-driven reliability improvements, and data readiness for the upcoming term. Key features and repository migrations implemented, with measurable business value through improved data accessibility, testing efficiency, and accurate operation schedules.
July 2025
15 Commits • 5 Features
Jul 1, 2025July 2025 — BCSDLab/KOIN_API_V2: Delivered a suite of platform enhancements across clubs, timetable, cart, and payments, driving improved user flows, data integrity, and system reliability. Key features include Club Features Enhancements with recruitment and event management, advanced search refinements, recruitment status logic improvements, API consistency and data validation; Timetable Management Enhancements addressing a NullPointerException in TimetableLectureResponse and an update to shuttle timetable vacation periods; Cart Inquiry Enhancements adding shop/menu thumbnail URLs and final_payment_amount with a related database migration; Payment & Order System Improvements introducing idempotency for cancellations and more flexible order schema with migration/version maintenance; and Shop Image URL Validation Update increasing the maximum length for shop category image URLs. Major bug fixes include API retrieval and event response corrections, case-insensitive search improvements, and Flyway version conflict resolution. Overall, these efforts reduced post-release incidents, strengthened data integrity, and optimized cart/payments flows, enabling more reliable, scalable user experiences and lower operational risk. Technologies/skills demonstrated include API design and consistency, robust data validation and DTO adjustments, database migrations with Flyway, NPE debugging, image URL handling, and resilient payment/order workflows with idempotency keys.
15 Commits • 5 Features
Jul 1, 2025July 2025 — BCSDLab/KOIN_API_V2: Delivered a suite of platform enhancements across clubs, timetable, cart, and payments, driving improved user flows, data integrity, and system reliability. Key features include Club Features Enhancements with recruitment and event management, advanced search refinements, recruitment status logic improvements, API consistency and data validation; Timetable Management Enhancements addressing a NullPointerException in TimetableLectureResponse and an update to shuttle timetable vacation periods; Cart Inquiry Enhancements adding shop/menu thumbnail URLs and final_payment_amount with a related database migration; Payment & Order System Improvements introducing idempotency for cancellations and more flexible order schema with migration/version maintenance; and Shop Image URL Validation Update increasing the maximum length for shop category image URLs. Major bug fixes include API retrieval and event response corrections, case-insensitive search improvements, and Flyway version conflict resolution. Overall, these efforts reduced post-release incidents, strengthened data integrity, and optimized cart/payments flows, enabling more reliable, scalable user experiences and lower operational risk. Technologies/skills demonstrated include API design and consistency, robust data validation and DTO adjustments, database migrations with Flyway, NPE debugging, image URL handling, and resilient payment/order workflows with idempotency keys.
July 2025
June 2025
25 Commits • 7 Features
Jun 1, 2025June 2025: Delivered stability-focused fixes and impactful features for BCSDLab/KOIN_API_V2, enhancing API reliability, data integrity, and cross‑platform workflows. Core API reliability was strengthened with Coin Club API fixes addressing reflection handling, request DTO validation, QA alignment, and admin index calculations. Key feature and validation improvements were shipped to improve user experience and data quality, including UI listing visibility flags, iOS detection in UserAgentResolver, and new input validation annotations. Platform security and commerce readiness were advanced via per‑platform refresh token issuance and the introduction of payment and order tables with corresponding schema adjustments. Additional validation enhancements for club location and contact data reduce invalid data and strengthen policy enforcement. These changes collectively improve client experience, admin efficiency, and business outcomes by enabling secure, scalable, and observable operations.
June 2025
25 Commits • 7 Features
Jun 1, 2025June 2025: Delivered stability-focused fixes and impactful features for BCSDLab/KOIN_API_V2, enhancing API reliability, data integrity, and cross‑platform workflows. Core API reliability was strengthened with Coin Club API fixes addressing reflection handling, request DTO validation, QA alignment, and admin index calculations. Key feature and validation improvements were shipped to improve user experience and data quality, including UI listing visibility flags, iOS detection in UserAgentResolver, and new input validation annotations. Platform security and commerce readiness were advanced via per‑platform refresh token issuance and the introduction of payment and order tables with corresponding schema adjustments. Additional validation enhancements for club location and contact data reduce invalid data and strengthen policy enforcement. These changes collectively improve client experience, admin efficiency, and business outcomes by enabling secure, scalable, and observable operations.
May 2025
12 Commits • 2 Features
May 1, 2025May 2025 performance summary for BCSDLab/KOIN_API_V2: Delivered a major overhaul of the Club Management System with API enhancements, added development-only error simulation utilities, and implemented robustness fixes across lecture timing and graduation calculations. The work improved club discovery and admin capabilities, increased API consistency, and strengthened error handling, delivering clear business value and system stability.
12 Commits • 2 Features
May 1, 2025May 2025 performance summary for BCSDLab/KOIN_API_V2: Delivered a major overhaul of the Club Management System with API enhancements, added development-only error simulation utilities, and implemented robustness fixes across lecture timing and graduation calculations. The work improved club discovery and admin capabilities, increased API consistency, and strengthened error handling, delivering clear business value and system stability.
May 2025
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025 focused on strengthening Admin capabilities and coin-related content management in BCSDLab/KOIN_API_V2. Delivered two major features with robust validation, migrated data structures, and updated documentation and tests, driving improved platform release controls and more flexible coin-announcement management. These changes lay groundwork for safer deployments and clearer admin workflows across web, Android, and iOS.
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025 focused on strengthening Admin capabilities and coin-related content management in BCSDLab/KOIN_API_V2. Delivered two major features with robust validation, migrated data structures, and updated documentation and tests, driving improved platform release controls and more flexible coin-announcement management. These changes lay groundwork for safer deployments and clearer admin workflows across web, Android, and iOS.
March 2025
18 Commits • 6 Features
Mar 1, 2025Concise monthly summary for 2025-03 focusing on key developer achievements in BCSDLab/KOIN_API_V2. The month delivered a mix of new features, reliability fixes, and maintainability improvements that directly support business goals around data accuracy, user experience, and secure authentication workflows.
18 Commits • 6 Features
Mar 1, 2025Concise monthly summary for 2025-03 focusing on key developer achievements in BCSDLab/KOIN_API_V2. The month delivered a mix of new features, reliability fixes, and maintainability improvements that directly support business goals around data accuracy, user experience, and secure authentication workflows.
March 2025
February 2025
12 Commits • 4 Features
Feb 1, 2025February 2025 monthly performance summary for BCSDLab/KOIN_API_V2. Delivered key features and robust fixes that elevate security, data integrity, and system reliability while enabling critical business capabilities like graduation planning and reliable communications.
February 2025
12 Commits • 4 Features
Feb 1, 2025February 2025 monthly performance summary for BCSDLab/KOIN_API_V2. Delivered key features and robust fixes that elevate security, data integrity, and system reliability while enabling critical business capabilities like graduation planning and reliable communications.
January 2025
9 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for BCSDLab/KOIN_API_V2. Focused on delivering business-value features, stabilizing APIs, and improving data integrity across the API surface. Key features delivered: API v3 for Lecture and Timetable with endpoints to create/update/retrieve regular and custom lectures, timetable frames, and online-lecture handling; validation and robustness improvements. API documentation improvements: Swagger grouping for upload/test/notification APIs and updated contributor docs. Academic Year 2025 data migration updated for correct year-term handling and initialization. Owner Data Retrieval bug fixed: null shop ID handling to prevent unnecessary lookups and improve accuracy. Impact: faster feature enablement for clients, more reliable data layer, and easier maintenance for contributors. Technologies demonstrated: API design and versioning, input validation, Swagger/OpenAPI documentation, data migrations, SQL query corrections, and robust data retrieval logic.
9 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for BCSDLab/KOIN_API_V2. Focused on delivering business-value features, stabilizing APIs, and improving data integrity across the API surface. Key features delivered: API v3 for Lecture and Timetable with endpoints to create/update/retrieve regular and custom lectures, timetable frames, and online-lecture handling; validation and robustness improvements. API documentation improvements: Swagger grouping for upload/test/notification APIs and updated contributor docs. Academic Year 2025 data migration updated for correct year-term handling and initialization. Owner Data Retrieval bug fixed: null shop ID handling to prevent unnecessary lookups and improve accuracy. Impact: faster feature enablement for clients, more reliable data layer, and easier maintenance for contributors. Technologies demonstrated: API design and versioning, input validation, Swagger/OpenAPI documentation, data migrations, SQL query corrections, and robust data retrieval logic.
January 2025
December 2024
7 Commits • 3 Features
Dec 1, 2024December 2024 Monthly Summary – BCSDLab/KOIN_API_V2 Overview: Delivered foundational data-model improvements, robust error handling, and developer-focused improvements that increase data integrity, API usability, and maintainability. The team executed targeted migrations, refactors, and documentation organization to enable scalable semester data modeling and clearer API navigation, aligning with business goals of accurate scheduling, reliable histories, and faster onboarding for developers. Key features delivered: - Lecture-Semester Relationship Overhaul: normalized relationship with a new FK, updated entities and migrations, and schema tweaks to support a date-based semester field. Commits: 8d0b74501b7be87517a6a1606eb7f96031c53cee; a7ef565afc31a29775ccdbbfe378202f34cb82d9; 3573e996241f6bb58487d1dd2400bcebc8ee2cec - Admin History Enhancements: introduced enums for request method and domain name with sorting options for history retrieval, plus related layer updates. Commit: 885875d7ae5fe1cb571b88342aa2e9b66c46d336 - API Documentation Organization: refactored Swagger to group endpoints by domain to improve navigation and developer experience. Commit: 2508fc171f5908f3f788e51484e2a6ef0ac5b944 Major bugs fixed: - Lecture Class Times Timetable Null Handling: added robust null checks to prevent NullPointerException and enforce data integrity. Commit: 17279fe43e53db2e9eb58fc9871dbc9ea0f362be - Timetable Rollback Correctness: improved rollback logic to mark the rolled-back frame as main when no other frames exist; cleaned imports and added existence check in repository. Commit: 48eaafc2cc456366a7241511f7bfacdd757c9a39 Overall impact and accomplishments: - Strengthened data integrity and consistency through data-model normalization and robust validation. - Reduced runtime risk with null handling in timetable creation and more reliable rollback behavior. - Improved developer experience and API usability via domain-based Swagger grouping and history query enhancements. - Accelerated onboarding and cross-team collaboration through clearer API documentation and stable history semantics. Technologies and skills demonstrated: - SQL migrations and database evolution (Flyway), including schema changes and migration scripts. - Data modeling: foreign keys, normalization, and date-based fields. - Backend robustness: null safety, exception handling, and rollback logic. - API tooling: Swagger documentation organization by domain, and enhanced history API surface via enums.
December 2024
7 Commits • 3 Features
Dec 1, 2024December 2024 Monthly Summary – BCSDLab/KOIN_API_V2 Overview: Delivered foundational data-model improvements, robust error handling, and developer-focused improvements that increase data integrity, API usability, and maintainability. The team executed targeted migrations, refactors, and documentation organization to enable scalable semester data modeling and clearer API navigation, aligning with business goals of accurate scheduling, reliable histories, and faster onboarding for developers. Key features delivered: - Lecture-Semester Relationship Overhaul: normalized relationship with a new FK, updated entities and migrations, and schema tweaks to support a date-based semester field. Commits: 8d0b74501b7be87517a6a1606eb7f96031c53cee; a7ef565afc31a29775ccdbbfe378202f34cb82d9; 3573e996241f6bb58487d1dd2400bcebc8ee2cec - Admin History Enhancements: introduced enums for request method and domain name with sorting options for history retrieval, plus related layer updates. Commit: 885875d7ae5fe1cb571b88342aa2e9b66c46d336 - API Documentation Organization: refactored Swagger to group endpoints by domain to improve navigation and developer experience. Commit: 2508fc171f5908f3f788e51484e2a6ef0ac5b944 Major bugs fixed: - Lecture Class Times Timetable Null Handling: added robust null checks to prevent NullPointerException and enforce data integrity. Commit: 17279fe43e53db2e9eb58fc9871dbc9ea0f362be - Timetable Rollback Correctness: improved rollback logic to mark the rolled-back frame as main when no other frames exist; cleaned imports and added existence check in repository. Commit: 48eaafc2cc456366a7241511f7bfacdd757c9a39 Overall impact and accomplishments: - Strengthened data integrity and consistency through data-model normalization and robust validation. - Reduced runtime risk with null handling in timetable creation and more reliable rollback behavior. - Improved developer experience and API usability via domain-based Swagger grouping and history query enhancements. - Accelerated onboarding and cross-team collaboration through clearer API documentation and stable history semantics. Technologies and skills demonstrated: - SQL migrations and database evolution (Flyway), including schema changes and migration scripts. - Data modeling: foreign keys, normalization, and date-based fields. - Backend robustness: null safety, exception handling, and rollback logic. - API tooling: Swagger documentation organization by domain, and enhanced history API surface via enums.
November 2024
10 Commits • 2 Features
Nov 1, 2024In 2024-11, BCSDLab/KOIN_API_V2 delivered major admin and timetable enhancements, improving security, auditability, data integrity, and ops efficiency. Admin Management and Monitoring now includes API for creating/logging in/changing password/retrieving admin accounts, admin activity history logging, and an endpoint to fetch current admin details. Timetable Management received deletions APIs for single and multiple lectures, refactors to timetable modules including timetableV2, robustness fixes around timetable lectures, and improved error handling. Key fixes include null checks for lecture times and a handler for ObjectOptimisticLockingFailureException to improve concurrency safety. Top features and improvements delivered this month: - Administrator Management and Monitoring: Admin API surface (create/login/change password/retrieve), activity history, current admin details. Commits include 8bd4b4058a..., e09eb7e5fc5..., 36881a96557c... - Timetable Management Enhancements and Refactoring: Mobile/regular lecture deletion API, batch delete via timetableLecture IDs, timetableV2 refactor, null checks, optimistic locking exception handling, and various timetableLecture fixes. Commits include bc5b554ae6d..., cb27a9f5d5f4..., bea2b2d082..., 38a52cdf3abd..., 6cb491cd95e3..., 0a47f33ed74f..., a3c3ae445d9f... Overall impact and accomplishments: - Enhanced admin capabilities and auditability, enabling safer credential management and activity tracking. - Improved timetable operations with single/multi-delete support and a more robust, maintainable timetable module. - Strengthened data integrity and resilience against concurrency issues with explicit exception handling and rigorous null checks. Technologies/skills demonstrated: - RESTful API design, Java/Spring-based services, module refactoring, and concurrency/exception handling. - Emphasis on input validation, error handling, and maintainability to support longer-term velocity and compliance.
10 Commits • 2 Features
Nov 1, 2024In 2024-11, BCSDLab/KOIN_API_V2 delivered major admin and timetable enhancements, improving security, auditability, data integrity, and ops efficiency. Admin Management and Monitoring now includes API for creating/logging in/changing password/retrieving admin accounts, admin activity history logging, and an endpoint to fetch current admin details. Timetable Management received deletions APIs for single and multiple lectures, refactors to timetable modules including timetableV2, robustness fixes around timetable lectures, and improved error handling. Key fixes include null checks for lecture times and a handler for ObjectOptimisticLockingFailureException to improve concurrency safety. Top features and improvements delivered this month: - Administrator Management and Monitoring: Admin API surface (create/login/change password/retrieve), activity history, current admin details. Commits include 8bd4b4058a..., e09eb7e5fc5..., 36881a96557c... - Timetable Management Enhancements and Refactoring: Mobile/regular lecture deletion API, batch delete via timetableLecture IDs, timetableV2 refactor, null checks, optimistic locking exception handling, and various timetableLecture fixes. Commits include bc5b554ae6d..., cb27a9f5d5f4..., bea2b2d082..., 38a52cdf3abd..., 6cb491cd95e3..., 0a47f33ed74f..., a3c3ae445d9f... Overall impact and accomplishments: - Enhanced admin capabilities and auditability, enabling safer credential management and activity tracking. - Improved timetable operations with single/multi-delete support and a more robust, maintainable timetable module. - Strengthened data integrity and resilience against concurrency issues with explicit exception handling and rigorous null checks. Technologies/skills demonstrated: - RESTful API design, Java/Spring-based services, module refactoring, and concurrency/exception handling. - Emphasis on input validation, error handling, and maintainability to support longer-term velocity and compliance.
November 2024
Activity
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Quality Metrics
Correctness87.2%
Maintainability86.4%
Architecture83.8%
Performance81.4%
AI Usage22.6%
Skills & Technologies
Programming Languages
GradleJSONJavaKotlinSQLYAML
Technical Skills
AOPAPI DesignAPI DevelopmentAPI DocumentationAPI RefactoringAPI developmentAWS SESAspect-Oriented Programming (AOP)AuthenticationAuthorizationBackend DevelopmentBug FixingBuild ConfigurationBuild ManagementCI/CD
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