lacks both a purpose and a strong pulse 
(ROOT (S (VP (VBZ lacks) (NP (CC both) (NP (DT a) (NN purpose)) (CC and) (NP (DT a) (JJ strong) (NN pulse))))))
(ROOT (S (VP (VBZ ) (NP (CC ) (NP (DT ) (NN )) (CC ) (NP (DT ) (JJ ) (NN ))))))