premise: Three men excavating what appears to be a mountainside.
hypothesis: Three men excavating a mountainside outdoors.
explanation_1: excavating what appears to be a mountainside  is the same as excavating a mountainside outdoors.
explanation_2: If it appears to be a mountainside, the men are outdoors excavating.
explanation_3: Three men excavating what appears to be a mountainside means excavating a mountainside outdoors.
premise_logic: exists x1 x2.(a_topic(x1) & exists e1 e2 p1 x3.(n_thing(x3) & Theme(e2,x3) & Actor(e2,x2) & v_excavate(e2) & Topic(e1,p1) & Actor(e1,x3) & v_appear(e1) & exists p2 x4.((x3 = x4) & n_mountainside(x4))) & (x1 = x2) & n_man(x1) & card_eq_3(x1))
hypothesis_logic: exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_excavate(e1) & n_outdoors(x3) & of(x3,x4) & n_mountainside(x4) & (x1 = x2) & n_man(x1) & card_eq_3(x1))