DOUBLET is a word game invented by Lewis
Carroll. The object of the game is to change a word into another word by successively changing only
one letter at the time to form a intermediate valid word. For example, the
following process changes the word CON to MOB:
Lewis Carroll, a mathematician and
inventor of the word game, Doublet, once worked all night
trying to make an anagram from the name William Ewart Gladstone.
Finally, he produced the anagram: