Question: regular expression grammar containing only the symbols a and b . It uses + instead of the union character | to avoid confusion with the

regular expression grammar containing only the symbols a and b. It uses + instead of the union character | to avoid confusion with the vertical bar used as a metasymbol in the grammar:regular expression grammar containing only the symbols a and b. It uses + instead of the union character | to avoid confusion with the vertical bar used as a metasymbol in the grammar:

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