save state 1;compare{3.1}{2.1} translate rotate;delay 2;compare{3.1}{4.1} translate rotate;delay 2;select {1 and 4.1} or {2 and 4.1};display add selected;select {1 and 3.1} or {2 and 3.1};display remove selected;delay 1;compare{4.1}{5.1} translate rotate;delay 2;compare{3.1}{6.1} translate rotate;delay 2;restore state 1