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D_2={1,2}
NWD(9,20)=1
D_20={1,2,4,5,10,20}
D_6={1,2,3,6}
NWD(20,6)=2
D_18={1,2,3,6,8,18}
D_15={1,3,5,15}
NWD(18,15)=3