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