premise: A man wearing a welding mask working on a duct.
hypothesis: The man is kneeling down.
explanation_1: The man must not be kneeling to weld.
explanation_2: Just because working on a duct does not mean kneeling down.
explanation_3: The man could be standing and welding overhead rather than kneeling.
premise_logic: exists e2 e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_wear(e2) & on(e1,x6) & n_duct(x6) & Actor(e1,x5) & v_work(e1) & (x3 = x5) & n_mask(x3) & of(x3,x4) & n_welding(x4) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists e1 s1 x1.(n_man(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_kneel(e1))
premise_sim: exists e2 e1 x1 x2 x3 x4 x5 x6.(v_work(e1) & v_wear(e2) & on(e1,x6) & of(x3,x4) & n_welding(x4) & n_mask(x3) & n_man(x1) & n_duct(x6) & a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & Actor(e1,x5) & (x3 = x5) & (x1 = x2))
hypothesis_sim: exists e1 s1 x1.(v_kneel(e1) & n_man(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1))