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The experimental primary school library is newly bought.
Storybook: GS- 12 04 15 003 (the third book in April 12)

Literature book: WX-120415003 (the third book in April12)

Art book: ys-120415003 (the third book in April12)

Storybook code: GS number is year, month, day, the last is the third book bought, the fifth is 005, and so on.

Is this coding okay? For reference.