Two children jumping in potato sacks.
Two children are racing each other in potato sacks.
Are these two children in the same potato sacks or separate potato sacks?  Two children jumping in potato sacks does not mean they are racing each other. They could be working as a team and racing a 3rd child.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & n_sack(x3) & of(x3,x4) & n_potato(x4) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists x1.(all x2.(n_other(x2) -> exists e1 x3 x4.(in(e1,x3) & n_sack(x3) & of(x3,x4) & n_potato(x4) & Theme(e1,x2) & Actor(e1,x1) & v_race(e1))) & n_child(x1) & card_eq_2(x1))