Abstract
We define a language L and show that it can be recognized by no two-way nondeterministic sensing multihead finite automaton with na reversal bound, where n is the length of input words, and 1/3>a>0 is a real number. Since L is recognized by a two-way deterministic two-head finite automaton working in linear time we obtain, for two-way finite automata, that time, reading heads, and nondeterminism as resources cannot compensate for the reversal number restriction.
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