premise: A man sitting on steps with a child as a bystander walks by.
hypothesis: A man and a child sitting on steps saw a woman walk by.
explanation_1: Bystander is woman.
explanation_2: A bystander can be a woman.
explanation_3: A man sitting on steps with a child is inferred as man and a child sitting and bystander  is inferred as woman.
premise_logic: exists e1 p1 x1 x2 x3 x4.(a_topic(x1) & exists e2 s1 x5.(a_by(s1) & Manner(e2,s1) & Actor(e2,x5) & v_walk(e2) & n_bystander(x5)) & as(e1,p1) & with(e1,x4) & n_child(x4) & on(e1,x3) & n_step(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists e3 e2 e1 s1 x1 x2 x3 x4 x5 x6 x7.(Theme(e3,x6) & Actor(e3,x1) & v_see(e3) & a_by(s1) & Manner(e2,s1) & Theme(e2,x7) & v_walk(e2) & (x6 = x7) & n_woman(x6) & subset_of(x3,x1) & on(e1,x5) & n_step(x5) & Actor(e1,x4) & v_sit(e1) & (x3 = x4) & n_child(x3) & subset_of(x2,x1) & n_man(x2))