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  1. or download this
    #! perl -slw
use strict;
...
( ( this OR that ) AND other )
( A or ( B and (C or D) ) or (E and F) )
(A or (B or C) or (D and E))
  2. or download this
    c:\test>junk5
Unbalanced parens '((A or B)' at c:\test\junk5.pl line 15, <DATA> line
+ 1.
...
[[this.OR.that].AND.other]
[A.or.[B.and.[C.or.D]].or.[E.and.F]]
[A.or.[B.or.C].or.[D.and.E]]