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#! /usr/bin/perl

...
group1 = router1,router5
group2 = router1, router2, router3
group3 = router2, router3, router4

$VAR1 = {
          'router1' => '192.168.1.2',
          'router3' => '192.168.1.4',
          'router2' => '192.168.1.3'
        };