(S (S (BASENP (PRP It)) (VP (VP (VBZ is) (ADJP (JJ curious))) (SBAR (WHADVP (WRB how)) (S (NP (BASENP (DT the) (NN inspection) (NN staff)) (CC and) (BASENP (DT the) (NNS technicians))) (VP (VP (VBD found) (BASENP (NN nothing))) (PP (IN on) (NP (NP (BASENP (PRPD their) (NN inspection)) (PP (IN of) (BASENP (DT the) (NN aircraft)))) (PP (ADVP (RB just)) (PP (IN before) (BASENP (DT the) (NN flight))))))))))) (PERIOD .))