16,17,

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16,17,
 

16 2012 17 n2=n 18 y-20=x+10

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,