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g=Graph[{4<->7,4<->8,4<->25,4<->30,4<->23,4<->24,5<->26,5<->11,5<->12,

5<->13,5<->14,5<->27,6<->28,6<->17,6<->18,6<->19,6<->20,6<->29,7<->8,

8<->9,10<->11,11<->12,13<->14,14<->15,16<->17,17<->18,20<->19,20<->21,

22<->23,23<->24,31<->32,32<->33,34<->35,35<->36,37<->38,38<->39}]


esl=Select[Subsets[EdgeList[g],{12}],IndependentEdgeSetQ[g,#]&]
Length[esl]
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yanyoub2Â¥
2018-09-18 12:37   »Ø¸´  
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luantan3Â¥
2018-09-18 12:39   »Ø¸´  
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tzynew4Â¥
2018-09-18 12:53   »Ø¸´  
±¿ÐܹÔ417(½ð±Ò+1): лл²ÎÓë
tzynew5Â¥
2018-09-18 13:03   »Ø¸´  
jnxxp67706Â¥
2018-09-18 13:08   »Ø¸´  
±¿ÐܹÔ417(½ð±Ò+1): лл²ÎÓë
berw9757Â¥
2018-09-18 13:17   »Ø¸´  
±¿ÐܹÔ417(½ð±Ò+1): лл²ÎÓë
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