( ( Back ( of ( ( the arm ) ( -LRB- ( Triceps -RRB- ) ) ) ) ) ( 2 . ) )
(ROOT (FRAG (ADVP (RB Back) (PP (IN of) (NP (NP (DT the) (NN arm)) (PRN (-LRB- -LRB-) (NP (NNP Triceps)) (-RRB- -RRB-))))) (NP (CD 2)) (. .)))
Back of the arm (Triceps) 2.
(ROOT (S (NP (DT The) (NNS triceps)) (VP (VBP help) (S (NP (DT the) (NN body)) (VP (VB extend) (NP (DT the) (NN arm))))) (. .)))