11:24 >perl 424_SoPW.pl
Before merging:
(1 2 4)
(7 13)
(3 5 6)
(7 8)
(10 11 12)
(1 5)

After merging:
(1 2 3 4 5 6)
(7 8 13)
(10 11 12)

12:17 >