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