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The computational power of 2-way pushdown automata with m additional counters (called mC-PDA) is investigated. It is shown that any multi-tape Turingmachine (with a two-way input tape) which accepts within time T(n), where n is the input length, can be simulated by a 3C-PDA whose counters are bounded by T(n) and that any such Turing machine can also be simulated by a 2C-PDA whose counters are bounded...
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