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