Question: CFG expressions: arithmetic expressions using nonnegative integers and the operations +, -, *, /, and parentheses to group terms. For example, the following are properly

CFG expressions: arithmetic expressions using nonnegative integers and the operations +, -, *, /, and parentheses to group terms. For example, the following are properly formatted arithmetic expressions: 0, 2, 2+30, 2+30*401, (2+30)*401*(23+0), ((((1+2)*3-4)/5+6)*7) The following are not: 02, (2+30, 2+30*401+, (2+30)*401), -4, 2++3, (), 2*()

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