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 Boolean Expressions
 ===================
 
    Boolean operations are also legal.  (POSIX `bc' does NOT have
 boolean operations). The result of all boolean operations are 0 and 1
 (for false and true) as in relational expressions.  The boolean
 operators are:
 
 `!expr'
      The result is 1 if expr is 0.
 
 `expr && expr'
      The result is 1 if both expressions are non-zero.
 
 `expr || expr'
      The result is 1 if either expression is non-zero.
 

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