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WHITESPACE = _{ " " }
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int = @{ ASCII_NONZERO_DIGIT ~ ASCII_DIGIT* }
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float = @{ int ~ "." ~ ASCII_DIGIT+ }
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num = @{ float | int }
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operator = _{ "+" | "-" | "*" | "/" }
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expr = { term ~ (operator ~ term)* }
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term = _{ num | "(" ~ expr ~ ")" }
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calculation = _{ SOI ~ expr ~ EOI }
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