premise: A man with a gray shirt is rehearsing in front of a empty drum set.
hypothesis: A man practices in front of a drum set.
explanation_1: Rehearsing and practices are synonyms
explanation_2: Rehearing is a synonym for practices.  A man with a gray shirt is rehearsing.
explanation_3: Sentence two is summarizing sentence 1 in less detail about the drum set.
premise_logic: exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(in(e1,x3) & of(x3,x4) & Theme(e2,x5) & v_set(e2) & (x4 = x5) & n_drum(x4) & a_empty(s2) & Theme(s2,x4) & n_front(x3) & Actor(e1,x1) & v_rehearse(e1) & with(x1,x2) & n_shirt(x2) & a_gray(s1) & Theme(s1,x2) & n_man(x1))
hypothesis_logic: exists s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & of(x3,x4) & n_set(x4) & a_drum(s1) & Theme(s1,x4) & n_front(x3) & n_practice(x1) & of(x1,x2) & n_man(x2))