( ( all ( of ( the tests ) ) ) ( ( contain ( ( ( at least ) two ) conditions ) ) . ) )
(ROOT (S (NP (NP (DT all)) (PP (IN of) (NP (DT the) (NNS tests)))) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS conditions))) (. .)))
all of the tests contain at least two conditions.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))