premise: A large group of protesters are walking down the street with signs.
hypothesis: The group of protesters are promoting legalizing gay marriage.
explanation_1: The first sentence does not mention promoting legalizing gay marriage,  there are just signs.
explanation_2: The protesters may not be promoting legalizing gay marriage.
explanation_3: Not all protests are about legalizing gay marriage.
premise_logic: exists e1 s1 x1 x2 x3 x4.(n_street(x3) & with(e1,x4) & n_sign(x4) & down(e1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_protester(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 p1 x1 x2.(n_group(x1) & exists e2 s1 x3.(Theme(e2,x3) & Actor(e2,x1) & v_legalize(e2) & n_marriage(x3) & a_gay(s1) & Theme(s1,x3)) & Topic(e1,p1) & Actor(e1,x1) & v_promote(e1) & of(x1,x2) & n_protester(x2))
premise_sim: exists e1 s1 x1 x2 x3 x4.(with(e1,x4) & v_walk(e1) & of(x1,x2) & n_street(x3) & n_sign(x4) & n_protester(x2) & n_group(x1) & down(e1,x3) & a_large(s1) & Theme(s1,x1) & Actor(e1,x1))
hypothesis_sim: exists e1 p1 x1 x2.(v_promote(e1) & of(x1,x2) & n_protester(x2) & n_group(x1) & exists e2 s1 x3.(v_legalize(e2) & n_marriage(x3) & a_gay(s1) & Theme(s1,x3) & Theme(e2,x3) & Actor(e2,x1)) & Topic(e1,p1) & Actor(e1,x1))