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(define (domain blocksworld-4ops)
(:requirements :strips)
(:predicates (clear ?x)
(ontable ?x)
(handempty)
(holding ?x)
(on ?x ?y))
(:action pick-up
:parameters (?ob)
:precondition (and (clear ?ob) (ontable ?ob) (handempty))
:effect (and (holding ?ob) (not (clear ?ob)) (not (ontable ?ob))
(not (handempty))))
(:action put-down
:parameters (?ob)
:precondition (holding ?ob)
:effect (and (clear ?ob) (handempty) (ontable ?ob)
(not (holding ?ob))))
(:action stack
:parameters (?ob ?underob)
:precondition (and (clear ?underob) (holding ?ob))
:effect (and (handempty) (clear ?ob) (on ?ob ?underob)
(not (clear ?underob)) (not (holding ?ob))))
(:action unstack
:parameters (?ob ?underob)
:precondition (and (on ?ob ?underob) (clear ?ob) (handempty))
:effect (and (holding ?ob) (clear ?underob)
(not (on ?ob ?underob)) (not (clear ?ob)) (not (handempty)))))
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