A.56 library(ugraphs): Graph manipulation library
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Availability::- use_module(library(ugraphs)).(can be autoloaded)
Sourcecompose(+LeftGraph, +RightGraph, -NewGraph)
Compose NewGraph by connecting the drains of LeftGraph to the sources of RightGraph. Example: 
?- compose([1-[2],2-[3]],[2-[4],3-[1,2,4]],L).
L = [1-[4], 2-[1,2,4], 3-[]]