Adults and children are sitting at tables eating.
There are people sitting at tables.
The people sitting at the tables are adults and children
exists e2 e1 x1 x2 x3 x4 x5.(at(e1,x4) & Actor(e2,x5) & v_eat(e2) & (x4 = x5) & n_table(x4) & Actor(e1,x1) & v_sit(e1) & n_child(x3) & n_adult(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & at(e1,x4) & n_table(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_people(x2))