premise: Two people are observing some ruins.
hypothesis: There are tourists visiting some ruins in Peru.
explanation_1: Not all people are tourists.  Not all ruins are in Peru.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & n_ruin(x2) & n_people(x1) & card_eq_2(x1))
hypothesis_logic: exists p1 x1 x5.(ne_geo_peru(x5) & exists e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_visit(e1) & in(x4,x5) & n_ruin(x4) & (x2 = x3) & n_tourist(x2)))
premise_sim: exists e1 x1 x2.(v_observe(e1) & n_ruin(x2) & n_people(x1) & card_eq_2(x1) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1 x5.(ne_geo_peru(x5) & exists e1 x2 x3 x4.(v_visit(e1) & n_tourist(x2) & n_ruin(x4) & in(x4,x5) & Theme(e1,x4) & Actor(e1,x3) & (x2 = x3) & (x1 = x2)))