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Original article Trees in Haskell | Dimitrios Kalemis Glossary 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 tree An undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. forest An undirected graph in which any two vertices are connected by at most one path, or equivalently an acyclic undirected graph, or equivalently a disjoint union of trees....