premise: Two young men in black tank tops playing on a set of drums.
hypothesis: Old men are playing guitars.
explanation_1: The subject is either a group of young or old men.
explanation_2: Old and young are two different stages of life.  Guitars and drums are different types of instruments.
explanation_3: Young men and old men are two different ages, and a set of drums is a different instrument than guitars.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & on(e1,x5) & of(x5,x6) & n_drum(x6) & n_set(x5) & Actor(e1,x4) & v_play(e1) & (x2 = x4) & n_top(x2) & of(x2,x3) & n_tank(x3) & a_black(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
hypothesis_logic: exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1) & a_old(s1) & Theme(s1,x1))