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Let = ab . Consider the language of all strings that contain exactly twice as many occurrences of b as occurrences of a . Call

Let

=

.

Consider the language of all strings that contain exactly twice as many occurrences of

b as occurrences of a

.

Call this language Labb. For example, abb

,

bababb and are in Labb, but

bbab

,

aba

,

and bbbabbb are not

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