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A word ladder puzzle begins with two words, and to solve the puzzle one must find a chain of other words to link the two, in which two successive words always differ by a single letter.

A word ladder puzzle begins with two words, and to solve the puzzle one must find a chain of other words to link the two, in which two successive words always differ by a single letter and no proper nouns are allowed.

Word ladders were invented by Lewis Carroll on Christmas day in 1877. Carroll published a series of word ladder puzzles and solutions (which at this time were called "Doublets") in the magazine "Vanity Fair".

Example:

| COLD 
| CORD
| CARD
| WARD
V WARM
forms a word ladder from COLD to WARM.

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