murder by numbers just does n't add up . 
(ROOT (S (NP (NP (NN murder)) (PP (IN by) (NP (NNS numbers)))) (ADVP (RB just)) (VP (VBZ does) (RB n't) (VP (VB add) (PRT (RP up)))) (. .)))
(ROOT (S (NP (NP (NN )) (PP (IN ) (NP (NNS )))) (ADVP (RB )) (VP (VBZ ) (RB ) (VP (VB ) (PRT (RP )))) (. )))