(unstack orange red robot)
(put-down orange robot)
(unstack red yellow robot)
(put-down red robot)
(unstack yellow purple robot)
(stack yellow red robot)
(unstack purple green robot)
(put-down purple robot)
(unstack green blue robot)
(put-down green robot)
(pick-up blue robot)
(stack blue yellow robot)
(pick-up green robot)
(stack green blue robot)
(pick-up purple robot)
(stack purple green robot)
(pick-up orange robot)
(stack orange purple robot)