( There ( ( 's ( ( ( at least ) two ) solutions ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ 's) (NP (QP (IN at) (JJS least) (CD two)) (NNS solutions))) (. .)))
There's at least two solutions.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))