boost_1_45_0/libs/graph/test/planar_input_graphs/planar_5_con_cycles_c.dimacs

c Five cycles connected to each other, plus some additional edges

p edge 21

e 0 1
e 1 2
e 2 3
e 3 4
e 4 0

e 5 6
e 6 7
e 7 8
e 8 9
e 9 5

e 10 11
e 11 12
e 12 13
e 13 14
e 14 10

e 15 16
e 16 17
e 17 18
e 18 19
e 19 15

ce 20 21
ce 21 22
ce 22 23
ce 23 24
ce 24 20

e 0 5
e 5 10
e 10 15
e 15 20
e 20 0

e 8 13
e 13 18