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use strict;
use warnings;
...
   grep { not $seen{ $_ } ++ }
   @lines
   };

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ows301.dom.com, 10.157.118.42,
oem300.dom.com, 10.157.124.58,
omo300.dom.com, 10.157.124.58,
pwd302.dom.com, 10.157.126.58,