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    expr            : binary_op(s?) term
    
    ...
                    | parens
    
    unary_op        : ('+'|'-'|'not') term
    
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    unary_op        : '+'   term
                    | '-'   term
                    | 'not' term
    
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    expr            : binary_op(s?) term
    
    ...
    # Highest precendance.
    
    term            : ...