Four people are sitting behind a table full of food.
Friends have a picnic on a table.
Just because the four people are sitting, does not imply that they are friends.
exists e1 s1 x1 x2 x3 x4.(behind(e1,x2) & of(s1,x4) & n_food(x4) & Theme(s1,x3) & a_full(s1) & (x2 = x3) & n_table(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & on(x2,x3) & n_table(x3) & n_picnic(x2) & n_friend(x1))