Question: 2 . 9 9 8 Let ? ? = { 0 , 1 , , @ , * * , ( ) , O ,

2.998 Let ??={0,1,,@,**,(),O,}
( We used the euro sign "" for the empty string to distinguish it from the empty string itself "", i.e.||=0 while ||=1).
Define |):} is a valid REGULAR EXPRESSION
2.998 Let ??={0,1,,@,**,(),O,} ( We used the euro sign "" for

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