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[ABNF] Add a clarification to the documentation.
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; usable as last resort in the definiens of a nonterminal.
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; While BNF allows arbitrary terminals,
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; ABNF uses only natural numbers as terminals,
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; ABNF uses only natural numbers (i.e. non-negative integers) as terminals,
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; and denotes them via:
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; (i) binary, decimal, or hexadecimal sequences,
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; e.g. `%b1.11.1010`, `%d1.3.10`, and `%x.1.3.A`
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