premise: The two people are crossing the river by walking on the rocks.
hypothesis: There are trees along the riverbank.
explanation_1: we don't know that there are trees along the riverbank.
premise_logic: exists e2 e1 x1 x2 x3.(n_rock(x3) & n_river(x2) & n_people(x1) & card_eq_2(x1) & by(e1,e2) & on(e2,x3) & Actor(e2,x1) & v_walk(e2) & Theme(e1,x2) & Actor(e1,x1) & v_cross(e1))
hypothesis_logic: exists p1 x1 x3.(n_riverbank(x3) & exists x2.((x1 = x2) & along(x2,x3) & n_tree(x2)))
premise_sim: exists e2 e1 x1 x2 x3.(v_walk(e2) & v_cross(e1) & on(e2,x3) & n_rock(x3) & n_river(x2) & n_people(x1) & card_eq_2(x1) & by(e1,e2) & Theme(e1,x2) & Actor(e2,x1) & Actor(e1,x1))
hypothesis_sim: exists x1 x3.(n_riverbank(x3) & exists x2.(n_tree(x2) & along(x2,x3) & (x1 = x2)))