ladder is a sequence of strings s1,s2,...,sk, wherein
Chapter , Problem 8.9(choose chapter or problem)
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.Let LADDERDFA = {hM,s,ti| M is a DFA and L(M) contains a ladder of strings, starting with s and ending with t}. Show that LADDERDFA is in PSPACE.
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