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1 5 . 1 A Two - Way DFA Let M be a 2 - way DFA with alphabet { a , b } ,
A TwoWay DFA
Let M be a way DFA with alphabet a b state set i p f start state i final state set f and transition function delta i ap Ldelta i bf Rdelta p ai Rdelta p bp Ldelta f ap R and delta f bf r
Then LM either accepts or rejects on every string beginning with b
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