#! perl
use strict;
use warnings;
use MyModule;
use YourModule;
# ... as before ...

##</code><code>##

#! perl
package SuperModule;
# ... as before ...
1;

##</code><code>##

#! perl
package MyModule;
use strict;
use warnings;
use SuperModule;
our @ISA = qw( SuperModule );
# ... as before ...
1;

##</code><code>##

#! perl
package YourModule;
use strict;
use warnings;
use SuperModule;
our @ISA = qw( SuperModule );
# ... as before ...
1;