(S (S (BASENP (PRP He)) (VP (VP (VBD fell) (ADVP (RB asleep))) (PP (IN during) (NP (BASENP (PRPD his) (NN examination)) (PP (IN of) (NP (BASENP (DT the) (NN stowaway)) (PP (IN of) (BASENP (DT the) (NN plane))))))))) (PERIOD .))