( ( Contain ( ( ( at least ) two ) stamps ) ) . )
(ROOT (S (VP (VB Contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS stamps))) (. .)))
Contain at least two stamps.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))