jeans discovered studied in addition plastic .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NNS_0 jeans)) (VP_4 (VBD_1 discovered) (VP_2 (VBN_0 studied) (PP_2 (IN_0 in) (NP_6 (NN_3 addition) (JJ_0 plastic)))))) (DOT_0 .)))