it should be : it had higher .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (S_1 (NP_0 (PRP_1 it)) (VP_5 (MD_0 should) (VP_1 (VB_0 be)))) (COLON_0 :)) (S_1 (NP_0 (PRP_1 it)) (VP_5 (VBD_1 had) (ADJP_0 (JJR_0 higher))))) (DOT_0 .)))