is never sure to make a clear point -- even if it seeks to rely on an ambiguous presentation . 
(ROOT (S (VP (VBZ is) (ADVP (RB never)) (ADJP (JJ sure) (S (VP (TO to) (VP (VB make) (NP (DT a) (JJ clear) (NN point)))))) (, --) (SBAR (ADVP (RB even)) (IN if) (S (NP (PRP it)) (VP (VBZ seeks) (S (VP (TO to) (VP (VB rely) (PP (IN on) (NP (DT an) (JJ ambiguous) (NN presentation)))))))))) (. .)))
(ROOT (S (VP (VBZ ) (ADVP (RB )) (ADJP (JJ ) (S (VP (TO ) (VP (VB ) (NP (DT ) (JJ ) (NN )))))) (, ) (SBAR (ADVP (RB )) (IN ) (S (NP (PRP )) (VP (VBZ ) (S (VP (TO ) (VP (VB ) (PP (IN ) (NP (DT ) (JJ ) (NN )))))))))) (. )))