Young boys and girls practice martial arts while being graded by peers and teachers sitting around the mats in a dojo.
Boys and girls fight each other in front of their peers.
Boys and girls can practice martial arts without fighting each other; they could be practicing solo.
(-x)
exists x1 x2 x3 x6.(all x4.(n_other(x4) -> exists e1 x5.(in(e1,x5) & of(x5,x6) & n_front(x5) & Theme(e1,x4) & Actor(e1,x1) & v_fight(e1))) & n_peer(x6) & of(x6,x2) & n_thing(x2) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_boy(x2))