node fA pc
node fB pc
node fC pc
node f_ pc
link link1 fA f_ 100 0 0
link link2 fB f_ 100 0 0
link link3 fC f_ 100 0 0
node C pc
link link4 C f_ 100 0 0
node l1 pc
node l2 pc
node l3 pc
link link5 l3 l2 100 0 0
link link6 l2 l1 100 0 0
link link7 l1 C 100 0 0
node r1 pc
node r2 pc
node r3 pc
link link8 r3 r2 100 0 0
link link9 r2 r1 100 0 0
link linkA r1 C 100 0 0