Actually, with a flip-flop, you can print the 2nd occurrence. 
    foreach $word (@words) {
        if ($word ne '') {
            my $flip = ($word eq $prevword)..($word ne $prevword);
            if ($flip eq '1') { # Use eq to avoid warning when flip is
+ ''
                print " $n $word\n";
            }
            $prevword = $word;
        }
    }

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In reply to Re^2: removing repeats by Roy Johnson
in thread removing repeats by dummy2

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