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- syntax ::= { rule }
- rule ::= identifier "::=" expression
- expression ::= term { "|" term }
- term ::= factor { factor }
- factor ::= identifier |
- quoted_symbol |
- "(" expression ")" |
- "[" expression "]" |
- "{" expression "}"
- identifier ::= letter { letter | digit }
- quoted_symbol ::= """ { any_character } """
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