20:2=10 ooVoo18:2=916:2=814:2=712:2=610:2=58:2=46:2=34:2=22:2=1
4:2=218:2=9
20:2=1012:2=68:2=4
6:2=314:2=716:2=8
2X2=42X4=82X3=62X6=122X7=142X8=162X9=182X10=20=======================================================
10:2=58:2=42:2=14:2=26:2=314:2=716:2=820:2=10
{2 ,4,6,8,10,12,14,16,18,20}.
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