( ( ( ( ( ( ( Four lists ) ( of stimuli ) ) ( were used ) ) , ) and ) ( each ( contained ( ( exactly ( one member ) ) ( of ( each ( quadruplet set ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (CD Four) (NNS lists)) (PP (IN of) (NP (NNS stimuli)))) (VP (VBD were) (VP (VBN used)))) (, ,) (CC and) (S (NP (DT each)) (VP (VBD contained) (NP (NP (RB exactly) (CD one) (NN member)) (PP (IN of) (NP (DT each) (JJ quadruplet) (NN set)))))) (. .)))
Four lists of stimuli were used, and each contained exactly one member of each quadruplet set.
(ROOT (S (NP (NP (CD Four) (NNS children)) (VP (VBN born) (PP (IN at) (NP (CD one) (NN birth))))) (VP (VBP are) (VP (VBN called) (NP (NNS quadruplets)))) (. .)))