premise: A man tests model airplanes in an open field.
hypothesis: A man is standing and testing model airplanes.
explanation_1: Not all model airplanes are tested while standing.
explanation_2: Just because a man tests model airplanes in a field it does not mean he is standing.
explanation_3: The man does not necessarily have to be standing to test model airplanes.
premise_logic: exists e1 s1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_test(e1) & in(x2,x4) & n_field(x4) & a_open(s1) & Theme(s1,x4) & n_airplane(x2) & of(x2,x3) & n_model(x3) & n_man(x1))
hypothesis_logic: exists e2 e1 x1 x2 x3 x4.(Theme(e2,x3) & Actor(e2,x2) & v_test(e2) & n_airplane(x3) & of(x3,x4) & n_model(x4) & n_man(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))