Three swimmers swim in their respective lanes.
Swimmers are swimming.
If swimmers swim they are also swimming
exists e1 s1 x1 x2.(in(e1,x2) & n_lane(x2) & a_respective(s1) & Theme(s1,x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_swim(e1) & n_swimmer(x1) & card_eq_3(x1))
exists e1 x1.(Actor(e1,x1) & v_swim(e1) & n_swimmer(x1))