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(define (domain METRO)
(:requirements :strips :typing)
(:types person
station
train)
(:predicates (at ?x - train ?y - station)
(in ?x - person ?y - train)
(on ?x - person ?y - station)
(connected ?x - station ?y - station))
(:action goto
:parameters (?origin - station ?destination - station ?x - train ?y - person)
:precondition (and (connected ?origin ?destination) (at ?x ?origin) (in ?y ?x))
:effect
(and (not (in ?x ?origin))
(at ?x ?destination)
(in ?y ?x))) ;; Person in train.
(:action exit
:parameters (?x - train ?y - person ?destination - station)
:precondition (and (in ?y ?x) (at ?x ?destination))
:effect
(and (not (in ?y ?x))
(on ?y ?destination)))
(:action getin
:parameters (?x - train ?y - person)
:precondition (and (not (in ?y ?x)))
:effect
(and (in ?y ?x))))
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