Two groups of swimmers wade out.
two groups of swimmers are ice skating
One group is swimming and another is ice skating.
exists e1 s1 x1 x2.(a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_wade(e1) & of(x1,x2) & n_swimmer(x2) & n_group(x1) & card_eq_2(x1))
exists e1 p1 x1 x2.(for(p1,e1) & Actor(e1,x1) & v_skate(e1) & exists x3.((x1 = x3) & n_ice(x3)) & of(x1,x2) & n_swimmer(x2) & n_group(x1) & card_eq_2(x1))