( There ( ( are ( ( ( ( at least ) two ) solutions ) ( to ( this problem ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (QP (IN at) (JJS least) (CD two)) (NNS solutions)) (PP (TO to) (NP (DT this) (NN problem))))) (. .)))
There are at least two solutions to this problem.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))