Eric Klieg:  That 's it ! I 've got it ! Finally , Boolean function of symbolic logic !
Dr. Who: Logic , yes , but ...
Kaftan: Everything yields to logic . Our basic assumption , Doctor .
Dr. Who: Really ?
Eric Klieg: _ Six _ , cap B four ... If and only if ... C is cap function of two A.
Dr. Who: I think perhaps your logic is wearing a little thin .
Eric Klieg: I must have made a mistake . I - I 'll do it again more carefully . Six , cup B four ... If and only if ... C is cup function of ... Ah !
Dr. Who: Ah !
Eric Klieg: That 's it ! Two F not two A ! I 've done it ! I 've done it !
Dr. Who: Congratulations !
Jamie: But , Doctor , you ...