( ( Within ( these four ) ) ( types ( ( are ( many variants ) ) . ) ) )
(ROOT (S (PP (IN Within) (NP (DT these) (CD four))) (NP (NNS types)) (VP (VBP are) (NP (JJ many) (NNS variants))) (. .)))
Within these four types are many variants.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS types)) (PP (IN of) (NP (NNS bosons))))) (. .)))