A surfer standing on an orange board who is about to catch a wave.
A surfer is snowboarding.
Surfer is different than snowboarding.
exists e1 p1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & on(e1,x3) & Topic(s1,p1) & Actor(s1,x5) & a_about(s1) & exists e2 x6.(Theme(e2,x6) & Actor(e2,x5) & v_catch(e2) & n_wave(x6)) & (x3 = x5) & n_board(x3) & of(x3,x4) & n_orange(x4) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_surfer(x1))
exists e1 x1.(Actor(e1,x1) & v_snowboard(e1) & n_surfer(x1))