EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/graph/test/planar_input_graphs/planar_line_1.dimacs

c a tree

p edge 12 11

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