Let = {0,1} and let D = {w|w contains an equal number of occurrences of the
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Let = {0,1} and let
D = {w|w contains an equal number of occurrences of the substrings 01 and 10}.
Thus 101 ∈ D because 101 contains a single 01 and a single 10, but 1010 ∉ D because 1010 contains two 10s and one 01. Show that D is a regular language.
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