it 's a ripper of a yarn 
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (NP (NP (DT a) (NN ripper)) (PP (IN of) (NP (DT a) (NN yarn)))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN )))))))