A ladder is a sequence of strings s 1 , s 2 , . . . ,
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A ladder is a sequence of strings s1, s2, . . . , sk, wherein every string differs from the preceding one by exactly one character. For example, the following is a ladder of English words, starting with “head” and ending with “free”: head, hear, near, fear, bear, beer, deer, deed, feed, feet, fret, free.
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