(S (S (NP (BASENP (NNP Detroit)) (PRN (COMMA ,) (NP (RB once) (NP (BASENP (NN one)) (PP (IN of) (NP (BASENP (DT the) (JJ top) (NN five) (NNP U.S.) (NNS cities)) (PP (IN in) (BASENP (NN population))))))) (COMMA ,))) (VP (VBZ has) (NP (NP (BASENP (PRPD its) (JJS lowest) (NN number)) (PP (IN of) (BASENP (NNS residents)))) (PP (IN since) (BASENP (NN 1910)))))) (PERIOD .))