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  1. or download this
    #        1         2         3
#234567890123456789012345678901
grep/^(([@_])(?!.*\2))+$/x,<D>;
  2. or download this
    qw(a d d) 
   ad
...
   add  <= wrong... but 'dad' got correctly skipped... I think
                    add gets through because the 'd's are right
                    next to each other