Node A has no downstream links
(1,B,0,-2,A)
(1,B,0,0,B)
(2,C,0,0,C)
(1,B,0,-1,D)
(0,0,0,1,E)
(0,0,0,0,F)
(0,0,0,2,G)
(0,0,0,1,H)
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