2.5.5 Logical Operators
Logical operators work with the Rexx strings 1 and 0, usually as a
result of a comparative operator.  These operators also only
result in logical TRUE; 1 or logical FALSE; 0.

     &    And       Returns 1 if both terms are 1.
     |    Inclusive or   Returns 1 if either term is 1.
     &&   Exclusive or   Returns 1 if either term is 1 but NOT
both terms.
     \    Logical not    Reverses the result; 0 becomes 1 and 1
becomes 0.


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