( ( Each element ) ( ( contains ( ( only ( one kind ) ) ( of atom ) ) ) . ) )
(ROOT (S (NP (DT Each) (NN element)) (VP (VBZ contains) (NP (NP (RB only) (CD one) (NN kind)) (PP (IN of) (NP (NN atom))))) (. .)))
Each element contains only one kind of atom.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NNS elements)) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (NP (NP (JJ only) (NNS atoms)) (PP (IN of) (NP (NP (CD one) (NN type)) (PP (IN of) (NP (NN element) (NN native) (NNS elements))))))))))) (. .)))