premise: a boy in a field
hypothesis: Nobody is in the field.
explanation_1: a boy cannot be in a field if nobody is in the field
premise_logic: exists x1 x2.(a_topic(x1) & in(x1,x2) & n_field(x2) & n_boy(x1))
hypothesis_logic: exists x2.(n_field(x2) & -exists p1 x1.(in(x1,x2) & n_person(x1)))
premise_sim: exists x1 x2.(n_field(x2) & n_boy(x1) & in(x1,x2) & a_topic(x1))
hypothesis_sim: exists x2.(n_field(x2) & all x1.(-n_person(x1) | -in(x1,x2)))