premise: A man is navigating a boat.
hypothesis: A man is on a water vehicle.
explanation_1: A boat is a form of water vehicle.
explanation_2: A boat is a water vehicle
explanation_3: a water vehicle is a boat
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_navigate(e1) & n_boat(x2) & n_man(x1))
hypothesis_logic: exists p1 x1.(exists x2 x3.(on(x1,x2) & n_vehicle(x2) & of(x2,x3) & n_water(x3)) & n_man(x1))