premise: The little boy stands in the middle of birds who have gathered on the sidewalk.
hypothesis: There are a lot of birds outside by the sidewalk.
explanation_1: There is a boy on the sidewalk by the birds.
explanation_2: Birds who have gathered are a lot of birds.   The sidewalk is to be found outside.
explanation_3: Birds is a rephrasing of lot of birds, and sidewalk implies outside.
premise_logic: exists e1 e2 s1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & n_middle(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1) & in(e1,x2) & of(x2,x3) & on(e2,x5) & Actor(e2,x4) & v_gather(e2) & (x3 = x4) & n_bird(x3) & Actor(e1,x1) & v_stand(e1))
hypothesis_logic: exists p1 x1 x5.(n_sidewalk(x5) & exists x2 x3 x4.((x1 = x2) & of(x2,x3) & by(x4,x5) & outside(x3,x4) & n_thing(x4) & n_bird(x3) & n_lot(x2)))
premise_sim: exists e1 e2 s1 x1 x2 x3 x4 x5.(v_stand(e1) & v_gather(e2) & on(e2,x5) & of(x2,x3) & n_sidewalk(x5) & n_middle(x2) & n_boy(x1) & n_bird(x3) & in(e1,x2) & a_little(s1) & Theme(s1,x1) & Actor(e2,x4) & Actor(e1,x1) & (x3 = x4))
hypothesis_sim: exists x1 x5.(n_sidewalk(x5) & exists x2 x3 x4.(outside(x3,x4) & of(x2,x3) & n_thing(x4) & n_lot(x2) & n_bird(x3) & by(x4,x5) & (x1 = x2)))