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Which of the following is true about Turing’s a-machine?

(a) a stands for automatic

(b) left ended, right end-infinite

(c) finite number of tape symbols were allowed

(d) all of the mentioned

This question was addressed to me in examination.

My question comes from Multitape Turing Machines in portion Introduction to Turing Machines of Automata Theory

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Right answer is (d) all of the mentioned

Easy explanation: Turings a- machine or automatic machine was left ended,right end infinite.Any of finite number of tape symbols were allowed and the 5 tuples were not in order.

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