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Filename : default.txt

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<syntax>         ::= <rule> | <rule> <syntax>
<rule>           ::= <opt-whitespace> "<" <rule-name> ">" <opt-whitespace> "::=" <opt-whitespace> <expression> <line-end>
<opt-whitespace> ::= " " <opt-whitespace> | ""
<expression>     ::= <list> | <list> <opt-whitespace> "|" <opt-whitespace> <expression>
<line-end>       ::= <opt-whitespace> <EOL> | <line-end> <line-end>
<list>           ::= <term> | <term> <opt-whitespace> <list>
<term>           ::= <literal> | "<" <rule-name> ">"
<literal>        ::= '"' <text> '"' | "'" <text> "'"