premise: somebody in the air on a board
hypothesis: There is nobody on a board.
explanation_1: Either there is somebody on a board or not. They can not both be true.
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.-exists x2 x3.((x1 = x2) & on(x2,x3) & n_board(x3) & n_person(x2))
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 x1.all x2 x3.(-on(x2,x3) | -n_person(x2) | -n_board(x3) | -(x1 = x2))