(S (S (BASENP (DT The) (NNS letters)) (VP (VBD were) (VP (VBN believed) (S (VP (TO to) (VP (VB have) (VP (VBN been) (VP (VBN mailed) (PP (IN from) (NP (BASENP (NNP Queens)) (COMMA ,) (BASENP (NNP New) (NNP York)))))))))))) (PERIOD .))