premise: A band is playing on a stage while a lady sings.
hypothesis: The band's lead singer performs.
explanation_1: A lady singing in a band is not necessarily the lead singer
explanation_2: That a lady sings while a band plays on stage does not necessarily imply the lady is their lead singer.
explanation_3: Lady does not necessarily have to be the lead singer.
premise_logic: exists e1 x1 x2 x3 x4.(while(e1,x3) & n_sing(x3) & of(x3,x4) & n_lady(x4) & on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_play(e1) & n_band(x1))
hypothesis_logic: exists x1 x2 x3 x4.(n_perform(x2) & of(x2,x4) & n_singer(x4) & of(x2,x3) & n_lead(x3) & of(x2,x1) & n_band(x1) & a_topic(x2))