premise: man grilling fish on barbecue
hypothesis: The man is sailing a boat.
explanation_1: The man cannot be sailing a boat and grilling fish.
explanation_2: A person cannot be grilling fish on barbecue, and sailing a boat at same time
explanation_3: Once cannot be grilling and sailing at the same time.
premise_logic: exists e1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_barbecue(x3) & n_fish(x1) & Actor(e1,x1) & v_grill(e1) & of(x1,x2) & n_man(x2))
hypothesis_logic: exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sail(e1) & n_boat(x2))