Question

***** constructing or design Turing Machines from implementation-level

descriptions.
All strings w of c’s and d’s such that reversing w and
replacing each c with d and each d with c again gives w
(e.g. ", cdcd, cccddd).
1. Find the first unmarked letter.
-1.a If it is not c or d, then reject.
-1.b Mark the first letter, and call it x.
-1.c If no unmarked letters remain, then accept.
2. Find the last unmarked letter; call it y.
-2.a If y 2 {c, d} and y 6= x, then mark y and go to 1.
-2.b Otherwise, reject

Answer 1

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