Two guys are practicing mixed martial arts on a blue and red mat.
The two guys compete on the mat.
Practicing does not imply compete.
exists e1 s1 s2 s3 s4 x1 x2 x3.(on(e1,x3) & n_mat(x3) & a_red(s4) & Theme(s4,x3) & a_blue(s3) & Theme(s3,x3) & Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_art(x2) & a_martial(s2) & Theme(s2,x2) & a_mixed(s1) & Theme(s1,x2) & n_guy(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_mat(x2) & n_guy(x1) & card_eq_2(x1) & on(e1,x2) & Actor(e1,x1) & v_compete(e1))