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MODULE ::= EXPR*
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EXPR ::=
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| OR
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| ASSERT
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ASSERT ::= (assert_eq|assert_ne) tuple
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OR ::= AND (or AND)*
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AND ::= EQNE (and EQNE)*
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EQNE ::= CMP ((eq|ne) CMP)?
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CMP ::= TERM ((lt|le|gt|ge) TERM)?
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TERM ::= FACTOR ((add|sub) FACTOR)*
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FACTOR ::= USUB ((mul|div|mod) USUB)*
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USUB ::= sub* NOT
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NOT ::= not* POW
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POW ::= IN (pow IN)?
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IN ::= LITERAL (in LITERAL)?
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LITERAL ::=
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| BUILTIN
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| TUPLE
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| INDEX
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| ARRAY
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| opar EXPR cpar
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ARRAY ::= osquare (EXPR (comma EXPR)*)? csquare
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INDEX ::=
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| (TUPLE|str|ARRAY) osquare (EXPR (comma EXPR)*)? csquare
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TUPLE ::=
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| opar EXPR+ cpar
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BUILTIN ::= num | bool | str
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