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