离æ£æ°å¦ä¸æå个å
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设A={1,2,3,4},Aä¸æ8个ç¸å®¹ï¼èªå,对称ï¼å
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{(1,1),(2,2),(3,3),(4,4)};
{(1,1),(2,2),(3,3),(4,4),(1,2),(2,1)};
{(1,1),(2,2),(3,3),(4,4),(1,3),(3,1)};
{(1,1),(2,2),(3,3),(4,4),(2,3),(3,2)};
{(1,1),(2,2),(3,3),(4,4),(1,2),(2,1),(1,3),(3,1)};
{(1,1),(2,2),(3,3),(4,4),(2,3),(3,2),(1,3),(3,1)};
{(1,1),(2,2),(3,3),(4,4),(1,2),(2,1),(2,3),(3,2)};
{(1,1),(2,2),(3,3),(4,4),(1,2),(2,1),(2,3),(3,2),(1,3),(3,1)};
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