hard-to-swallow premise 
(ROOT (NP (ADJP (JJ hard) (HYPH -) (SBAR (S (VP (IN to) (HYPH -) (VP (VB swallow)))))) (NN premise)))
(ROOT (NP (ADJP (JJ ) (HYPH ) (SBAR (S (VP (IN ) (HYPH ) (VP (VB )))))) (NN )))