A dog is running through the yard
A band is performing on stage.
There can be either a dog running or a band is performing.
exists e1 x1 x2.(n_yard(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_perform(e1) & n_band(x1))