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PROG ::= INSTR*
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INSTR ::=
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| DIR
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| EXPR semicolon
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DIR ::= hash ident EXPR
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EXPR ::=
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| ADDSUB
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ADDSUB ::= MULDIVMOD ((add|sub) MULDIVMOD)*
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MULDIVMOD ::= LITERAL ((mul|div|mod) LITERAL)*
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LITERAL ::=
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| ident
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| int
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