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https://hackage.haskell.org/package/fgl-5.7.0.3/docs/Data-Graph-Inductive-Example.html
Кто-нибудь что-нибудь понял?
Size: a a a
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mkUGraphM [1, 2, 3] [(1, 2), (2, 3), (3, 1)]
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let
g = empty
[a, b, c] = newNodes g
in insEdges
[ (a, b, "a to b")
, (b, c, "foo")
, (c, a, "bar")
] g
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