blocksworld 4
initial
(empty)
(ontable 3)
(ontable 4)
(clear 4)
(clear 2)
(on 1 3)
(on 2 1)
goal
(empty)
(ontable 1)
(ontable 4)
(clear 4)
(clear 3)
(on 2 1)
(on 3 2)
end