2 girls playing volleyball, one striking the ball.
There are no people in the gym.
There are either 2 girls or no people.
exists e1 e2 x1 x2 x3 x4.(n_ball(x4) & Theme(e2,x4) & Actor(e2,x3) & v_strike(e2) & n_thing(x3) & card_eq_1(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_volleyball(x2) & n_girl(x1) & n_date(x1) & a_date_day_02(x1) & a_date_day_02(x1))
exists p1 x1 x2.(n_gym(x2) & in(p1,x2) & -exists x3.((x1 = x3) & n_people(x3)))