Two people, a man and a woman, are on a stage at a band.
They are all on the stage.
Two people, a man and a woman, are on a stage simply means they are all on stage
exists p1 x1 x2 x3 x4 x5 x6.(at(p1,x6) & n_band(x6) & exists x7.(on(x1,x7) & n_stage(x7)) & subset_of(x3,x1) & subset_of(x5,x3) & n_woman(x5) & subset_of(x4,x3) & n_man(x4) & subset_of(x2,x1) & n_people(x2) & card_eq_2(x2))
exists p1 x1 x2.(n_stage(x2) & n_thing(x1) & r_all(x1) & on(x1,x2))