premise: A man in an orange vest is on the sidewalk playing a guitar and singing while others are walking down the sidewalk.
hypothesis: A man is playing an acoustic guitar on the sidewalk while a woman and a man walk down the sidewalk.
explanation_1: A guitar is not assumed to be acoustic.  Others does not imply a man and man.
explanation_2: Just because a man in an orange vest is on the sidewalk playing a guitar and singing while others are walking down the sidewalk, doesn't mean it is an acoustic guitar.
explanation_3: Not all guitars are acoustic therefore a man playing a guitar may not be playing an acoustic guitar.
premise_logic: exists e1 e2 p1 p2 x1 x2 x3 x4 x5.(n_sidewalk(x5) & n_sidewalk(x5) & n_person(x5) & for(p1,e2) & exists e3 x6.(down(e3,x5) & Actor(e3,x6) & v_walk(e3) & -(x6 = x5) & n_person(x6)) & while(e2,p2) & Actor(e2,x1) & v_sing(e2) & for(p1,e1) & Theme(e1,x4) & Actor(e1,x1) & v_play(e1) & n_guitar(x4) & on(x1,x5) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_man(x1))
hypothesis_logic: exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7.(n_sidewalk(x3) & n_sidewalk(x3) & while(e1,x4) & subset_of(x6,x4) & down(e2,x3) & Theme(e2,x7) & v_walk(e2) & (x6 = x7) & n_man(x6) & subset_of(x5,x4) & n_woman(x5) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & on(x2,x3) & n_guitar(x2) & a_acoustic(s1) & Theme(s1,x2) & n_man(x1))