( ( Many herbalists ) ( ( believe ( that ( ( the ( ( most beneficial ) ( Echinacea supplements ) ) ) ( contain ( ( a combination ) ( of ( ( ( ( ( at least ) two ) , ) and ) ( ( perhaps all ) ( three species ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Many) (NNS herbalists)) (VP (VBP believe) (SBAR (IN that) (S (NP (DT the) (ADJP (RBS most) (JJ beneficial)) (NNP Echinacea) (NNS supplements)) (VP (VBP contain) (NP (NP (DT a) (NN combination)) (PP (IN of) (NP (NP (QP (IN at) (JJS least) (CD two))) (, ,) (CC and) (NP (NP (QP (RB perhaps) (DT all))) (NP (CD three) (NNS species)))))))))) (. .)))
Many herbalists believe that the most beneficial Echinacea supplements contain a combination of at least two, and perhaps all three species.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))