People are sitting outside on a deck at tables.
People are sitting on a deck.
People who are sitting outside could be sitting on a deck and sitting on chairs at tables on that deck.
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_table(x3) & on(e1,x2) & n_deck(x2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists e1 x1 x2.(on(e1,x2) & n_deck(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))