(S (S (S (BASENP (NNS Firefighters)) (VP (VBP are) (VP (VBG using) (NP (NP (BASENP (DT a) (NN helicopter)) (PRN (COMMA ,) (NP (BASENP (NN courtesy)) (PP (IN of) (NP (BASENP (DT the) (NNP Erie) (NNP County) (NNP Sheriff) (POS 's)) (NNP Department)))) (COMMA ,))) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN equipped) (PP (IN with) (BASENP (JJ infrared) (NNS cameras))))))))))) (SBAR (SBAR (IN in) (IN order)) (S (VP (TO to) (VP (VB see) (NP (NP (BASENP (DT the) (NNS areas)) (PP (IN of) (BASENP (DT the) (NN building)))) (SBAR (WHNP (WDT which)) (S (VP (ADVP (RB still)) (VP (VBP contain) (NP (BASENP (DT a) (JJ significant) (NN amount)) (PP (IN of) (BASENP (NN heat) (CC or) (NN fire)))))))))))))) (PERIOD .))