( ( ( Three types ) ( of ( ( signatures , ) ( many scenarios ) ) ) ) . )
(ROOT (NP (NP (CD Three) (NNS types)) (PP (IN of) (NP (NP (NNS signatures)) (, ,) (NP (JJ many) (NNS scenarios)))) (. .)))
Three types of signatures, many scenarios.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS types)) (PP (IN of) (NP (NNS galaxies))))) (. .)))