premise: A young boy in green shorts balances on a pipe above a river.
hypothesis: Nobody is balancing.
explanation_1: If nobody is balancing, then the subject cannot be balancing.
explanation_2: Boy cannot be balancing on the river and nobody is  balancing. Nobody means not one person is balancing.
explanation_3: boy doesn't mean nobody
premise_logic: exists s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & on(x2,x4) & above(x4,x5) & n_river(x5) & n_pipe(x4) & n_balance(x2) & of(x2,x3) & n_shorts(x3) & a_green(s2) & Theme(s2,x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: -exists e1 x1.(Actor(e1,x1) & v_balance(e1) & n_person(x1))
premise_sim: exists s1 s2 x1 x2 x3 x4 x5.(on(x2,x4) & of(x2,x3) & n_shorts(x3) & n_river(x5) & n_pipe(x4) & n_boy(x1) & n_balance(x2) & in(x1,x2) & above(x4,x5) & a_young(s1) & a_topic(x1) & a_green(s2) & Theme(s2,x2) & Theme(s1,x1))
hypothesis_sim: all e1 x1.(-v_balance(e1) | -n_person(x1) | -Actor(e1,x1))