(S (S (NP (EX There)) (VP (VBP are) (NP (BASENP (DT some) (ADJP (RB very) (JJ low-level)) (NN unit) (NNS standards)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (ADJP (ADJP (RB extraordinarily) (JJ easy)) (S (VP (TO to) (VP (VB pass))))))))))) (COLON ...))