16,17,

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16,17,
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16,17,
16,17,
 

16,17,
B,D,B

16,17, 16,17, 16,17, 16,17, 16 17 16~17 16 17 16 17 16 17 16,17, 16 17 16 17 16 17 16 17 16 17 16 17 16,17, 16,17,