5 lines
176 B
Plaintext
5 lines
176 B
Plaintext
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expression -> wedge ( ( "->" | "<->" ) wedge)*
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wedge -> unary ( ( "^" | "v" ) unary)*;
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unary -> "~" unary | primary;
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primary -> atom | "(" expression ")" ;
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atom -> [pqrs] ;
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