the problem with the mayhem in formula 51 
(ROOT (NP (NP (DT the) (NN problem)) (PP (IN with) (NP (NP (DT the) (NN mayhem)) (PP (IN in) (NP (NN formula) (CD 51)))))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ) (CD )))))))