k-19 : the widowmaker is a great yarn . 
(ROOT (NP (NP (CD k) (HYPH -) (CD 19)) (: :) (S (NP (DT the) (NN widowmaker)) (VP (VBZ is) (NP (DT a) (JJ great) (NN yarn)))) (. .)))
(ROOT (NP (NP (CD ) (HYPH ) (CD )) (: ) (S (NP (DT ) (NN )) (VP (VBZ ) (NP (DT ) (JJ ) (NN )))) (. )))