actual          detected
ball 2 light   ball 2 heavy
ball 5 light   ball 6 light
ball 6 light   ball 5 light
ball 7 light   ball 8 light
ball 8 light   ball 7 light
ball 1 heavy   ball 5 light
ball 2 heavy   ball 5 light
ball 3 heavy   ball 6 light
ball 9 heavy   ball 10 heavy
ball 10 heavy  ball 9 heavy