george and lucy 's most obvious differences to ignite sparks 
(ROOT (NP (NP (NP (NNP george) (CC and) (NN lucy) (POS 's)) (ADJP (RBS most) (JJ obvious)) (NNS differences)) (SBAR (S (VP (TO to) (VP (VB ignite) (NP (NNS sparks))))))))
(ROOT (NP (NP (NP (NNP ) (CC ) (NN ) (POS )) (ADJP (RBS ) (JJ )) (NNS )) (SBAR (S (VP (TO ) (VP (VB ) (NP (NNS ))))))))