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#!/usr/bin/perl --
use strict;
use warnings;
...
    MyFrndJk::create( $conf, $input, $courl, $codir, $dbdir );
    MyFrndJk::difference( $conf, $courl, $codir, );
} ## end sub Main

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package MyFrndJk;
## save as MyFrndJk.pm (so its a module)
use strict;
...

1;    ## all modules end with this 1