Martial arts students sit on the floor or stand in the background while watching a matchup between two people.
Karate students are watching two classmates in a match.
Martial arts can be things other than karate. The two people are not necessarily classmates.
exists e1 p1 x1 x3 x4.(n_background(x4) & (n_floor(x3) | n_stand(x3)) & ne_nam_martial(x1) & exists e3 e2 x2 x5 x6.(while(e2,e3) & between(e3,x6) & n_people(x6) & card_eq_2(x6) & Theme(e3,x5) & Actor(e3,x2) & v_watch(e3) & n_matchup(x5) & in(e2,x4) & on(e2,x3) & Actor(e2,x2) & v_sit(e2) & n_student(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_art(e1))
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_match(x4) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & n_classmate(x3) & card_eq_2(x3) & n_student(x1) & (x1 = x2) & ne_nam_karate(x2))