i1 : G = graph(toList(0..9),{
{0,{6,7}},{1,{4,9}},{2,{3,5}},{3,{7,8}},
{4,{5,8}},{5,{8}},{6,{8,9}},{7,{8}},{8,{9}} });
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i2 : Gc = chordalGraph G
o2 = ChordalGraph{0 => {6, 7} }
1 => {4, 9}
2 => {3, 5}
3 => {5, 7, 8}
4 => {5, 8, 9}
5 => {7, 8, 9}
6 => {7, 8, 9}
7 => {8, 9}
8 => {9}
9 => {}
o2 : ChordalGraph
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