A group of campers grill food over a burn barrel.
People are cooking outdoors.
Campers are People and cooking is the same as grill food.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & over(x1,x4) & n_barrel(x4) & of(x4,x5) & n_burn(x5) & of(x1,x2) & n_food(x2) & a_grill(s1) & Theme(s1,x2) & of(x2,x3) & n_camper(x3) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_cook(e1) & n_outdoors(x2) & n_people(x1))