in which the slack execution italicizes the absurdity of the premise 
(ROOT (SBAR (WHPP (IN in) (WHNP (WDT which))) (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 (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (DT ) (NN ) (NN )) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN ))))))))