premise: somebody in the air on a board
hypothesis: There is a board in the air.
explanation_1: If somebody is on a board in the air, then the board itself must be in the air.
premise_logic: exists x1 x2 x3.(n_air(x2) & a_topic(x1) & in(x1,x2) & on(x2,x3) & n_board(x3) & n_person(x1))
hypothesis_logic: exists p1 x1 x2.(n_air(x2) & in(p1,x2) & exists x3.((x1 = x3) & n_board(x3)))
premise_sim: exists x1 x2 x3.(on(x2,x3) & n_person(x1) & n_board(x3) & n_air(x2) & in(x1,x2) & a_topic(x1))
hypothesis_sim: exists p1 x1 x2.(n_air(x2) & in(p1,x2) & exists x3.(n_board(x3) & (x1 = x3)))