(S (S (BASENP (DT The) (NNS engineers)) (VP (ADVP (RB then)) (VP (VP (VP (VP (VBD shut) (PRT (RP down))) (NP (BASENP (NN two)) (PP (IN of) (BASENP (DT the) (NN nine) (NNS engines))))) (PRN (COLON --) (SBAR (SBAR (IN in) (NN order)) (S (VP (TO to) (VP (VP (VB limit) (BASENP (JJ potential) (NN damage))) (PP (TO to) (BASENP (DT the) (NN launch) (NN pad))))))) (COLON --))) (CC and) (VP (VP (VP (VBD continued) (BASENP (DT the) (NN test))) (PP (IN for) (BASENP (QP (NN 18) (JJR more)) (NNS seconds)))) (PP (IN before) (S (ADVP (RB finally)) (VP (VP (VBG shutting) (BASENP (DT the) (NN rocket))) (PRT (RP down))))))))) (PERIOD .))