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