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Doublets is a type of word puzzle invented by Lewis Carroll (author of Alice in Wonderland). The goal is to change one word into another by adding, removing, or changing one letter at a time. The tricky part is that each intermediate step must also be a valid word.

Contributed by: Christian Peccei (March 2011)
Open content licensed under CC BY-NC-SA



If we think of words as vertices in a graph, then two words are connected by an edge if the EditDistance between them is exactly 1. Mathematica can then be used to solve Doublets with its shortest‐path algorithm GraphPath.

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