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