heavy best cluster like a gravel was been .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_6 (ATNP_1 (NP_4 (JJ_1 heavy)) (JJS_0 best)) (NN_1 cluster)) (PP_0 (IN_1 like) (NP_5 (DT_0 a) (NN_2 gravel)))) (VP_4 (VBD_1 was) (VP_2 (VBN_0 been)))) (DOT_0 .)))