Martial arts students practice outside building.
There is a boxing match in an indoor ring.
Martial arts and boxing are two different activities.  They cannot both be outside and inside.  It's either a practice or a match, not both.
exists e1 p1 x1 x2.(ne_nam_martial(x1) & exists e2 s1 x3.(Theme(e2,x3) & Actor(e2,x2) & v_practice(e2) & n_building(x3) & a_outside(s1) & Theme(s1,x3)) & Recipient(e1,p1) & Actor(e1,x1) & Topic(e1,x2) & v_art(e1) & n_student(x2))
exists p1 s1 x1 x2.(in(p1,x2) & n_ring(x2) & a_indoor(s1) & Theme(s1,x2) & exists e1 x3.((x1 = x3) & n_match(x3) & Actor(e1,x3) & v_box(e1)))