People enjoying themselves on Jet Skis.
People are on jet skis and racing each other.
just because people are enjoying them self on Jet Skis doesn't mean they racing against each other
exists e1 x1 x2 x3 x4 x5.(ne_org_skis(x4) & (x4 = x5) & ne_org_jet(x5) & n_group(x3) & a_topic(x1) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_enjoy(e1) & (x1 = x2) & n_people(x1))
exists p1 x1.(exists x2 x3 x4 x5.(on(x1,x2) & all x6.(n_other(x6) -> exists e1.(subset_of(e1,x2) & Theme(e1,x6) & Actor(e1,x5) & v_race(e1))) & n_thing(x5) & subset_of(x3,x2) & n_ski(x3) & of(x3,x4) & n_jet(x4)) & n_people(x1))