A.if i %2==1:continueB.if i %2==0:continueC.if i //2==1:continueD.if i //2==0:continue
A.range(10,0,-1)B.range(10,1,-1)C.range(9,0,-1)D.range(9,1,-1)
A.range(0,11,2)B.range(0,10,2)C.range(1,11,2)D.range(1,10,2)