with an unusual protagonist ( a kilt-wearing jackson ) and subject matter , the improbable `` formula 51 '' is somewhat entertaining , but it could have been much stronger . 
(ROOT (S (S (PP (IN with) (NP (NP (NP (DT an) (JJ unusual) (NN protagonist)) (-LRB- -LRB-) (NP (DT a) (ADJP (NN kilt) (HYPH -) (VBG wearing)) (NN jackson)) (-RRB- -RRB-)) (CC and) (NP (NN subject) (NN matter)))) (, ,) (NP (DT the) (JJ improbable) (`` ``) (NN formula) (CD 51) ('' '')) (VP (VBZ is) (ADJP (RB somewhat) (JJ entertaining)))) (, ,) (CC but) (S (NP (PRP it)) (VP (MD could) (VP (VB have) (VP (VBN been) (ADJP (RB much) (JJR stronger)))))) (. .)))
(ROOT (S (S (PP (IN ) (NP (NP (NP (DT ) (JJ ) (NN )) (-LRB- ) (NP (DT ) (ADJP (NN ) (HYPH ) (VBG )) (NN )) (-RRB- )) (CC ) (NP (NN ) (NN )))) (, ) (NP (DT ) (JJ ) (`` ) (NN ) (CD ) ('' )) (VP (VBZ ) (ADJP (RB ) (JJ )))) (, ) (CC ) (S (NP (PRP )) (VP (MD ) (VP (VB ) (VP (VBN ) (ADJP (RB ) (JJR )))))) (. )))