premise: Police officer with riot shield stands in front of crowd.
hypothesis: A police officer teaches two children something.
explanation_1: The officer can't teaches children while they stands with riot shields.
explanation_2: A crowd contains more than two children.
explanation_3: crowd not same as children
premise_logic: exists e1 x1 x2 x3 x4 x5 x6.(in(e1,x5) & of(x5,x6) & n_crowd(x6) & n_front(x5) & Actor(e1,x1) & v_stand(e1) & with(x1,x3) & n_shield(x3) & of(x3,x4) & n_riot(x4) & n_officer(x1) & (x1 = x2) & ne_nam_police(x2))
hypothesis_logic: exists e1 s1 x1 x2 x3.(a_something(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_teach(e1) & n_child(x3) & card_eq_2(x3) & n_officer(x1) & of(x1,x2) & n_police(x2))