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- <program> ::= <statement>
- | <program> <statement>
- <statement> ::= "p" <expression> ";"
- | "s" <leftvar> ";"
- <expression> ::= "+" <expression> <expression>
- | "-" <expression> <expression>
- | "(" <expression> <expression>
- | <rightvar>
- | <number>
- <leftvar> ::= "x" | "y" | "z"
- <rightvar> ::= "x" | "y" | "z"
- <number> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' |'9'
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