i1 : L= { {{{1},{2},{3},{4,5}},-1}, {{{1},{2,5},{3},{4}},1}, {{{1,4},{2},{3},{5}},1},{{{1,3},{2},{4},{5}},1}};
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i3 : tex C
o3 = -1F_{\{1\}, \{2\}, \{3\}, \{4, 5\}} + F_{\{1, 4\}, \{2\}, \{3\}, \{5\}}
+ F_{\{1\}, \{2, 5\}, \{3\}, \{4\}} + F_{\{1, 3\}, \{2\}, \{4\}, \{5\}}
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