Frozen songs back were bare diamond stronger .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (NP_1 (NN_1 Frozen) (NNS_0 songs)) (ADVP_0 (RB_0 back))) (VP_3 (VBD_1 were) (ADJP_0 (JJ_0 bare) (S_2 (NP_2 (NN_3 diamond)) (ADJP_0 (JJR_0 stronger)))))) (DOT_0 .)))