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Define the syntax of all integers that are divisible by 20 (they satisfy the condition |N|...

Define the syntax of all integers that are divisible by 20 (they satisfy the condition |N| mod 20 = 0).
(a)    Solve this problem using BNF
(b)    Solve this problem using EBNF
(c)    Solve this problem using parenthetic notation (first explain your notation)

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