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#! perl
use Modern::Perl;
...
5 10 11 12 13
6
7 1

 1:30 >perl 424_SoPW.pl
(1 2 3 4 6 7)
(5 10 11 12 13)

 1:34 >

#! perl
use Modern::Perl;
...
7 8
10 11 12
1 5

11:24 >perl 424_SoPW.pl
Before merging:
...
(10 11 12)

12:17 >