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18 1,2,3,6,9,18
31 1,31
36 1,2,3,4,6,9,12,18,36
50 1,2,5,10,25,50
18 : 3, 18,1, 6,2
31 : 31,1
36 : 6,4,9,36,1
50 : 5,10,2