| [update]ページの追加, 削除周りの修正 | 
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| src/main/java/org/ntlab/acanthus_server/entities/Animation.java | 
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| src/main/java/org/ntlab/acanthus_server/entities/Page.java | 
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| src/main/java/org/ntlab/acanthus_server/resources/gallery/LayersRest.java | 
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| src/main/java/org/ntlab/acanthus_server/resources/gallery/PagesRest.java | 
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| src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java | 
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