to consider the unthinkable , the unacceptable , the unmentionable 
(ROOT (S (VP (TO to) (VP (VB consider) (NP (NP (DT the) (JJ unthinkable)) (, ,) (NP (DT the) (JJ unacceptable)) (, ,) (NP (DT the) (JJ unmentionable)))))))
(ROOT (S (VP (TO ) (VP (VB ) (NP (NP (DT ) (JJ )) (, ) (NP (DT ) (JJ )) (, ) (NP (DT ) (JJ )))))))