premise: One boy is driving a play tractor while the other boy jumps off the back of the play tractor.
hypothesis: There is only one boy present.
explanation_1: There cannot be the other boy if there is only one boy.
explanation_2: If there is one boy driving and another boy jumping, there must be more than one boy present.
explanation_3: There can either be only one boy or two boys, i.e. one boy and the other boy.
premise_logic: exists e1 p1 x1 x2 x3 x4 x5 x6.(n_back(x6) & exists e2.(Actor(e2,x4) & v_tractor(e2) & off(x4,x6) & of(x6,x2)) & n_play(x2) & n_play(x2) & -(x4 = x5) & n_jump(x5) & of(x5,x1) & n_boy(x1) & n_boy(x1) & n_jump(x4) & of(x4,x1) & while(e1,p1) & Time(e1,x3) & n_tractor(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & card_eq_1(x1))
hypothesis_logic: exists p1 x1 x2 x3.((x1 = x2) & n_present(x2) & of(x2,x3) & n_boy(x3) & card_eq_1(x2) & r_only(x2))
premise_sim: exists e1 p1 x1 x2 x3 x4 x5 x6.(while(e1,p1) & v_drive(e1) & of(x5,x1) & of(x4,x1) & n_tractor(x3) & n_play(x2) & n_jump(x5) & n_jump(x4) & n_boy(x1) & n_back(x6) & exists e2.(v_tractor(e2) & off(x4,x6) & of(x6,x2) & Actor(e2,x4)) & card_eq_1(x1) & Time(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & -(x4 = x5))
hypothesis_sim: exists x1 x2 x3.(r_only(x2) & of(x2,x3) & n_present(x2) & n_boy(x3) & card_eq_1(x2) & (x1 = x2))