Use this tag for questions in graph theory. Here a graph is a collection of vertices and connecting edges. Use (graphing-functions) instead if your question is about graphing or plotting functions.

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Domino Trains Questions

A train is an end-to-end arrangement of dominoes such that the adjoining halves of neighboring dominoes have the same number of dots. A "double-$n$'' domino set has one of each possible domino using ...