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Lewis Carroll’s doublet, which changes ELM into OAK by seven links, introducing the name of another tree as one of them, is solved thus by him—
ELM, ELL, ALL, AIL, AIR, FIR, FAR, OAR, OAK.
A shorter solution is by these six links—Ely, sly, say, bay, bat, oat; and one of these (bay) is also a tree, as was fir, so that the conditions given are fulfilled.
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