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#!/usr/bin/perl
use Firework;
...
$display->add_wheel(60,22,8);

$display->start_display;

package Firework;
use Firework::Rockets;
...
}

1;

package Firework::Rockets;
use Firework;
...
}

1;

package Firework::Catherine;
use Firework;
...
}

1;