premise: Woman singing on stage in front of backup dancers
hypothesis: Nobody is singing
explanation_1: The woman in the first sentence is singing, whereas the second sentence claims no one is singing.
explanation_2: Woman and nobody are different things.
explanation_3: The woman can't be singing and not singing.
premise_logic: exists e1 x1 x2 x3 x4 x5.(ne_nam_woman(x1) & in(e1,x3) & of(x3,x4) & n_dancer(x4) & of(x4,x5) & n_backup(x5) & n_front(x3) & on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_sing(e1))
hypothesis_logic: -exists e1 x1.(Actor(e1,x1) & v_sing(e1) & n_person(x1))