( ( Simple Machines ) ( ( covers ( ( ( ( ( ( ( ( ( simple machines ) , ) ( types ( of energy ) ) ) , ) levers ) , ) ramps ) and ) wheels ) ) . ) )
(ROOT (S (NP (NNP Simple) (NNPS Machines)) (VP (VBZ covers) (NP (NP (JJ simple) (NNS machines)) (, ,) (NP (NP (NNS types)) (PP (IN of) (NP (NN energy)))) (, ,) (NP (NNS levers)) (, ,) (NP (NNS ramps)) (CC and) (NP (NNS wheels)))) (. .)))
Simple Machines covers simple machines, types of energy, levers, ramps and wheels.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types) (NNS types)) (PP (IN of) (NP (JJ simple) (NNS machines))))) (. .)))