1 03/31/83  and
 2 
 3 Syntax:  and {tf_args}
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 6 Syntax as active function:  [and {tf_args}]
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 8 
 9 Function:  returns true if all the tf_args are equal to true; otherwise
10 it returns false.  If there are no tf_args, it returns the
11 "true" "and" identity.  If any of the tf_args has a value other than
12 true or false, an error message is printed.