Two people are observing some ruins.
Some people are looking at the ruins.
Observing is synonymous with looking. Two people counts as some people.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & n_ruin(x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_ruin(x2) & at(e1,x2) & Actor(e1,x1) & v_look(e1) & n_people(x1))