People enjoying themselves on Jet Skis.
The people are sleeping at home.
One can not be enjoying Jet Skis and sleeping at home simultaneously.
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 e1 x1 x2.(n_people(x1) & at(e1,x2) & n_home(x2) & Actor(e1,x1) & v_sleep(e1))