Three male and female pairs of dancers are on the stage at the ballet, with other ballerinas in the background.
a bunch of dancers are on stage for the first time
Being on the stage does not imply it is for the first time.
exists p1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_background(x7) & n_ballerina(x6) & n_ballet(x4) & n_stage(x8) & with(p1,x5) & in(x5,x7) & -(x5 = x6) & n_ballerina(x5) & at(p1,x4) & on(x1,x8) & of(x1,x3) & n_dancer(x3) & n_pair(x1) & a_female(s1) & Theme(s1,x1) & of(x1,x2) & n_male(x2) & card_eq_3(x1))
exists p1 s1 x1 x2 x3.(n_time(x3) & a_first(s1) & Theme(s1,x3) & for(p1,x3) & exists x4.(on(x1,x4) & n_stage(x4)) & of(x1,x2) & n_dancer(x2) & n_bunch(x1))