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1 6 ( 5 marks ) Consider the following high - level description of a Turing Machine. What language on { a , b }
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Consider the following highlevel description of a Turing Machine. What language on does
the TM accept?
Sweep Left to Right.
If there is an a after the first b
REJECT
Move head to Start. Search for a
IF found, replace with
ELSE Go to Step
REPEAT twice :
Search for b
IF found, replace with
ELSE REJECT
Go to Step
Move head to Start. Search for b
IF found, ACCEPT
ELSE REJECT
You may assume that the tape contains only s and at the start.
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