People are sitting at two long tables, one behind the other, with beverage containers and papers.
People are sitting down.
sitting at  implies  down.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_other(x4) & with(e1,x5) & subset_of(x8,x5) & n_papers(x8) & subset_of(x6,x5) & n_container(x6) & of(x6,x7) & n_beverage(x7) & at(e1,x2) & rel(x2,x3) & behind(x3,x4) & n_thing(x3) & card_eq_1(x3) & n_table(x2) & a_long(s1) & Theme(s1,x2) & card_eq_2(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists e1 s1 x1.(a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_people(x1))