Question: Give production rules in extended Backus-Naur form that generate all decimal numerals consisting of an optional sign, a nonnegative integer, and a decimal fraction that

Give production rules in extended Backus-Naur form that generate all decimal numerals consisting of an optional sign, a nonnegative integer, and a decimal fraction that is either the empty string or a decimal point followed by an optional positive integer optionally preceded by some number of zeros.

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