premise: Shirtless man with long pole navigates covered boat down a palm tree lined river past a hut.
hypothesis: A man without a shirt is on a river.
explanation_1: Shirtless doesn't imply being without a shirt.
explanation_2: He may be not without a shirt, but not wearing it.
explanation_3: A person can be on a river without being on a boat.
premise_logic: exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(Theme(e2,x3) & Actor(e2,x1) & v_navigate(e2) & down(x3,x4) & past(e1,x8) & n_hut(x8) & Time(e1,x7) & n_river(x7) & Actor(e1,x6) & v_line(e1) & (x4 = x6) & n_tree(x4) & of(x4,x5) & n_palm(x5) & n_boat(x3) & a_covered(s3) & Theme(s3,x3) & with(x1,x2) & n_pole(x2) & a_long(s2) & Theme(s2,x2) & n_man(x1) & a_shirtless(s1) & Theme(s1,x1))
hypothesis_logic: exists p1 x1.(exists x3.(on(x1,x3) & n_river(x3)) & -exists x2.(with(x1,x2) & n_shirt(x2)) & n_man(x1))