cluster months <apostrophe>s the gravel hippie .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NN_1 cluster) (NNS_0 months)) (VP_4 (VBZ_0 <apostrophe>s) (NP_6 (ATNP_1 (DT_0 the) (JJ_1 gravel)) (NN_1 hippie)))) (DOT_0 .)))