Answers

2016-06-15T15:29:33+08:00
{1,3}, {1,5}, {1,7}, {1,9}, {3,5}, {3,7}, {3,9}, {5,7}, {5,9}, {1,3,5}, {1,3,7}, {1,3,9} 
{3,5,7}, {3,5,9}, {5,7,9}, {1,3,5,7}, {1,3,5,9}, {3,5,7,9}
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