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Not, And, Or
Syntax
Not E
E And F
E Or F

where E and F are of type BOOL.
Summary
boolean operators
Description
These operators have their usual meanings.  Note that when two or more
boolean expressions are combined with AND, they are evaluated one by
one until a FALSE expression is found. The rest are not evaluated.
For example, given the expression "A And B", the system does not
attempt to evaluate B unless A evaluates to TRUE.  Similarly,
evaluation of a sequence of boolean expressions connected by OR stops
as soon as a TRUE expression is found.