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- <01> ::= <|<=|=|<>|>=|>|in
- <02> ::= +|-|or
- <03> ::= /|div|mod|and
- <04> ::= not
- <w1> ::= <w2>|<w1><01><w2>
- <w2> ::= <w3>|-<w3>|<w2><02><w3>
- <w3> ::= <w4>|<w3>|<03><w4>
- <w4> ::= <w>|<04><w>
- <w> ::= <atom>|(<w1>)
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