pure math
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[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y
2 g1 M, ~9 W/ \8 g2 G" `2 s7 z5.39.217.77:8898公仔箱論壇; q) V4 f; r) |$ q6 k
if x = 111 y = 2222, you number is 111-2222 |