Four boys playing soccer.
There are twin boys playing soccer.
There are four boys playing soccer but there aren't necessarily twin boys playing.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_soccer(x3) & (x1 = x2) & n_boy(x1) & card_eq_4(x1))
exists p1 x1 e1 s1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_soccer(x4) & (x2 = x3) & n_boy(x2) & a_twin(s1) & Theme(s1,x2))