possess the lack-of-attention span that we did at seventeen 
(ROOT (S (VP (VB possess) (NP (NP (DT the) (NML (NML (NN lack)) (HYPH -) (PP (IN of) (HYPH -) (NP (NN attention)))) (NN span)) (SBAR (WHNP (WDT that)) (S (NP (PRP we)) (VP (VBD did) (PP (IN at) (NP (CD seventeen))))))))))
(ROOT (S (VP (VB ) (NP (NP (DT ) (NML (NML (NN )) (HYPH ) (PP (IN ) (HYPH ) (NP (NN )))) (NN )) (SBAR (WHNP (WDT )) (S (NP (PRP )) (VP (VBD ) (PP (IN ) (NP (CD ))))))))))