In a boolean expression using logical operators, the equalities and
inequalities must be in parentheses. NOT takes precedence over AND, which
takes precedence over OR. For example, the expression

(A > B) or not(C > D) and (E > F)

is interpreted as

(A > B) or ((not(C > D)) and (E > F))

If in doubt, use parentheses.

Because of roundoff error, you should avoid using A = B if A or B involves non-integers.

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