the slack execution italicizes the absurdity of the premise 
(ROOT (S (NP (DT the) (NN slack) (NN execution)) (VP (VBZ italicizes) (NP (NP (DT the) (NN absurdity)) (PP (IN of) (NP (DT the) (NN premise)))))))
(ROOT (S (NP (DT ) (NN ) (NN )) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN )))))))