the formula is familiar but enjoyable . 
(ROOT (S (NP (DT the) (NN formula)) (VP (VBZ is) (ADJP (JJ familiar) (CC but) (JJ enjoyable))) (. .)))
(ROOT (S (NP (DT ) (NN )) (VP (VBZ ) (ADJP (JJ ) (CC ) (JJ ))) (. )))