premise: A red bi-plane leaves a white trail in a blue sky.
hypothesis: The airplane is flying in the sky.
explanation_1: A bi-plane is a type of airplane, and it can only leave a white trail in a blue sky if it is flying in the sky.
explanation_2: Flying in the sky a bi-plane leaves a white trail in the sky.
explanation_3: A bi-plane is a variety of airplane, and it could not be leaving a trail in the sky were it not flying.
premise_logic: exists e1 s1 s2 s3 x1 x2 x3.(in(e1,x3) & n_sky(x3) & a_blue(s3) & Theme(s3,x3) & Theme(e1,x2) & Actor(e1,x1) & v_leave(e1) & n_trail(x2) & a_white(s2) & Theme(s2,x2) & n_bi-plane(x1) & a_red(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 x1 x2.(n_sky(x2) & n_airplane(x1) & in(e1,x2) & Actor(e1,x1) & v_fly(e1))