A dirt biker aggitates dirt on a four wheeler.
A dirt biker agitates sand on a motorcycle.
The dirt biker is either on dirt or sand. The dirt biker cannot be on a four wheeler and a motorcycle simultaneously.
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_wheeler(x4) & card_eq_4(x4) & Theme(e1,x3) & Actor(e1,x1) & v_aggitate(e1) & n_dirt(x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_motorcycle(x4) & Theme(e1,x3) & Actor(e1,x1) & v_agitate(e1) & n_sand(x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))