premise: Some people are playing ping-pong.
hypothesis: Some people are playing professional ping-pong
explanation_1: Playing ping pong does not mean people are professional.
explanation_2: We have no idea if he is playing a professional game or just a friendly game.
explanation_3: Not all ping pong players are professional.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_ping-pong(x2) & n_people(x1))
hypothesis_logic: exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_ping-pong(x2) & a_professional(s1) & Theme(s1,x2) & n_people(x1))