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8 lines
153 B
Racket
8 lines
153 B
Racket
8 years ago
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#lang brag
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expr : term (/'+' term)*
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@term : factor (/'*' @factor)*
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factor : ("0" | "1" | "2" | "3"
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| "4" | "5" | "6" | "7"
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| "8" | "9")+
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