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