A greyhound sporting number 4 is racing.
The greyhound is leading the race.
A greyhound sporting number 4 is racing that is not leading the race.
exists e1 p1 x1 x2.(exists x3.((x1 = x3) & n_racing(x3)) & n_number(x1) & n_date(x1) & a_date_day_04(x1) & a_date_day_04(x1) & Actor(e1,x1) & v_sport(e1) & of(x1,x2) & n_greyhound(x2))
exists e1 x1 x2.(n_race(x2) & n_greyhound(x1) & Theme(e1,x2) & Actor(e1,x1) & v_lead(e1))