Kids participate in a potato sack race.
Kids are participating in a 100 meter dash.
Can't participate in both a 100 meter dash and sack race simultaneously.
exists e1 x1 x2 x3 x4.(in(e1,x2) & n_race(x2) & of(x2,x4) & n_sack(x4) & of(x2,x3) & n_potato(x3) & Actor(e1,x1) & v_participate(e1) & n_kid(x1))
exists e1 x1 x2 x3.(in(e1,x2) & n_dash(x2) & of(x2,x3) & n_meter(x3) & card_eq_100(x2) & Actor(e1,x1) & v_participate(e1) & n_kid(x1))