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this problem is about pushdown automata:4. (10 points) Explain in English what each of the following transition labels mean: a. 2,272 b. a, i = 2 C. a, A+B d. a, a →

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Answer #1

Answer:

a.

on reading epsilon(nothing) , without looking at top of the stack and without modifying the stack.

b.

on reading a , without looking at the top of the stack and without modifying the stack contents.

c.

on reading a , and top of the stack symbol is 'A' then push 'B' on to the stack.

d.

on reading a , wihtout looking at the top of the stack push 'B' onto the stack.

e.

on reading a and the top of the stack is 'A' then POP the top of the stack i.e, A.

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