premise: Man on bike, with bike clothing and helmet on, having trouble maneuvering through sand from beach.
hypothesis: The man is sailing a boat.
explanation_1: In the first sentence the man is on a bike on the beach. The second he is sailing a boat.  It is different activities
explanation_2: If the man is in the sand on the beach he can't be sailing a boat which requires him to be in the water.
explanation_3: A man on bike cannot be sailing on boat as well.
premise_logic: exists e1 p1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & with(x1,x3) & on(x3,e1) & exists e2 x9 x10.(through(e2,x9) & from(x9,x10) & n_beach(x10) & n_sand(x9) & Actor(e2,x8) & v_maneuver(e2)) & Recipient(e1,p1) & Actor(e1,x7) & Topic(e1,x8) & v_have(e1) & n_trouble(x8) & n_thing(x7) & n_helmet(x5) & n_clothing(x4) & of(x4,x6) & n_bike(x6) & subset_of(x5,x3) & subset_of(x4,x3) & on(x1,x2) & n_bike(x2) & n_man(x1))
hypothesis_logic: exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sail(e1) & n_boat(x2))
premise_sim: exists e1 p1 x1 x2 x3 x4 x5 x6 x7 x8.(with(x1,x3) & v_have(e1) & subset_of(x5,x3) & subset_of(x4,x3) & on(x3,e1) & on(x1,x2) & of(x4,x6) & n_trouble(x8) & n_thing(x7) & n_man(x1) & n_helmet(x5) & n_clothing(x4) & n_bike(x6) & n_bike(x2) & exists e2 x9 x10.(v_maneuver(e2) & through(e2,x9) & n_sand(x9) & n_beach(x10) & from(x9,x10) & Actor(e2,x8)) & a_topic(x1) & Topic(e1,x8) & Recipient(e1,p1) & Actor(e1,x7))
hypothesis_sim: exists e1 x1 x2.(v_sail(e1) & n_man(x1) & n_boat(x2) & Theme(e1,x2) & Actor(e1,x1))