Numbers began wafting about on the  I'd say at least five
( Numbers ( began ( ( wafting ( about ( on ( the I ) ) ) ) ( 'd ( say ( ( at least ) five ) ) ) ) ) )
(ROOT (S (NP (NNS Numbers)) (VP (VBD began) (SBAR (S (NP (NP (VBG wafting)) (PP (IN about) (PP (IN on) (NP (DT the) (NN I))))) (VP (MD 'd) (VP (VB say) (NP (QP (IN at) (JJS least) (CD five))))))))))
I had to pick at least one number.
( I ( ( had ( to ( pick ( ( ( at least ) one ) number ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD had) (S (VP (TO to) (VP (VB pick) (NP (QP (IN at) (JJS least) (CD one)) (NN number)))))) (. .)))