smart and alert , thirteen conversations about one thing is a small gem . 
(ROOT (S (S (ADJP (JJ smart) (CC and) (NN alert))) (, ,) (NP (NP (CD thirteen) (NNS conversations)) (PP (IN about) (NP (CD one) (NN thing)))) (VP (VBZ is) (NP (DT a) (JJ small) (NN gem))) (. .)))
(ROOT (S (S (ADJP (JJ ) (CC ) (NN ))) (, ) (NP (NP (CD ) (NNS )) (PP (IN ) (NP (CD ) (NN )))) (VP (VBZ ) (NP (DT ) (JJ ) (NN ))) (. )))