A group of people do tricks on motorbikes.
People running with tricks
People do tricks does not imply people are running.
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_motorbike(x4) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_trick(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_trick(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_people(x1))