because the intelligence level of the characters must be low , very low , very very low , for the masquerade to work 
(ROOT (SBAR (IN because) (S (NP (NP (DT the) (NN intelligence) (NN level)) (PP (IN of) (NP (DT the) (NNS characters)))) (VP (MD must) (VP (VB be) (ADJP (JJ low) (, ,) (ADJP (RB very) (JJ low)) (, ,) (ADJP (RB very) (RB very) (JJ low)) (, ,)) (SBAR (IN for) (S (NP (DT the) (NN masquerade)) (VP (TO to) (VP (VB work))))))))))
(ROOT (SBAR (IN ) (S (NP (NP (DT ) (NN ) (NN )) (PP (IN ) (NP (DT ) (NNS )))) (VP (MD ) (VP (VB ) (ADJP (JJ ) (, ) (ADJP (RB ) (JJ )) (, ) (ADJP (RB ) (RB ) (JJ )) (, )) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (TO ) (VP (VB ))))))))))