A black greyhound with the number seven is in the middle of a race.
A greyhound is racing.
Numbers are used to identify participants in a race.
exists p1 s1 x1 x2 x3.(n_middle(x3) & n_number(x2) & card_eq_7(x2) & exists x4.(in(x1,x3) & of(x3,x4) & n_race(x4)) & with(x1,x2) & n_greyhound(x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_race(e1) & n_greyhound(x1))