romped up and down the aisles for bathroom breaks 
(ROOT (S (VP (VBD romped) (PP (RP up) (CC and) (IN down) (NP (DT the) (NNS aisles))) (PP (IN for) (NP (NN bathroom) (NNS breaks))))))
(ROOT (S (VP (VBD ) (PP (RP ) (CC ) (IN ) (NP (DT ) (NNS ))) (PP (IN ) (NP (NN ) (NNS ))))))