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Ex. 2.3.8. Give regular expressions describing the following languages. All words w {a,b}* whose length is even. All words w {a,b}* containing exactly one occurrence

Ex. 2.3.8. Give regular expressions describing the following languages. All words w {a,b}* whose length is even. All words w {a,b}* containing exactly one occurrence of ab. All words w e {a,b,c}* containing no occurrence of ab

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