(QT (DQL ``) (QTC (S (BASENP (DT This) (JJ large) (NN number)) (VP (VBZ suggests) (SBAR (IN that) (S (BASENP (DT the) (NN collision)) (VP (MD must) (VP (VB have) (VP (VBN been) (ADJP (RB relatively) (JJ head-on))))))))) (PERIOD .)) (DQR ''))