( ( ( bone tissue ) 6 ) . )
(ROOT (NP (NP (NN bone) (NN tissue)) (NP (CD 6)) (. .)))
bone tissue 6.
(ROOT (S (NP (NNS Bones)) (VP (VBP are) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NNS tissues))))) (. .)))