of a valentine sealed with a kiss 
(ROOT (PP (IN of) (NP (NP (DT a) (NN valentine)) (VP (VBN sealed) (PP (IN with) (NP (DT a) (NN kiss)))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (VP (VBN ) (PP (IN ) (NP (DT ) (NN )))))))