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package My::ThereCanBeOnlyOne;
use strict;
...
}

1;

use My::ThereCanBeOnlyOne 'myprogram';

use My::ThereCanBeOnlyOne 'myprogram',
                          -hold  => 0,
                          -stale => 1,
                          -max   => 1;

use My::ThereCanBeOnlyOne 'myprogram'.int(rand(6));