(S (S (BASENP (NNP Batey)) (VP (VBD presented) (NP (NP (BASENP (NN 500) (NN episodes)) (PP (IN of) (BASENP (DT the) (NN TV) (NN program)))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VP (VBD tested) (BASENP (JJ married) (NNS persons))) (PP (IN on) (NP (BASENP (PRPD their) (NN knowledge)) (PP (IN of) (BASENP (PRPD their) (NNS partners)))))) (S (VP (TO to) (VP (VB see) (SBAR (WHNP (WDT which) (WHNP (WDT which) (NN couple))) (VP (VBD had) (NP (BASENP (DT the) (JJS best) (NN knowledge)) (PP (IN of) (BASENP (DT each) (JJ other))))))))))))))) (PERIOD .))