EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/graph/test/planar_input_graphs/planar_line_1_p4.dimacs

p edge 12 11
e 0 5
e 2 4
e 3 7
e 4 9
e 5 11
e 6 1
e 7 2
e 8 6
e 9 8
e 10 3
e 11 10