Question: Consider the regular expressions: letter , = a | b | c | d | LETTER = A | B | C | D |

Consider the regular expressions:
letter ,=a|b|c|d|
LETTER = A |B|C|D|
digit ,=4|5|6|7|9
R 1=(LETTER | digit
Consider the regular expressions: letter ,=a|b|c|d| LETTER = A |B|C|D| digit

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