Remove unused
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@ -29,10 +29,6 @@ from dataclasses import dataclass
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from relational import rtypes
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from relational import rtypes
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RELATION = 0
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UNARY = 1
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BINARY = 2
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PRODUCT = '*'
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PRODUCT = '*'
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DIFFERENCE = '-'
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DIFFERENCE = '-'
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UNION = '∪'
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UNION = '∪'
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