Two martial artists practice in a vacant room.
There are just two people indoors
The martial artists are people, and a vacant room is indoors.
exists s1 s2 x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_room(x3) & a_vacant(s2) & Theme(s2,x3) & n_practice(x1) & of(x1,x2) & n_artist(x2) & a_martial(s1) & Theme(s1,x1) & card_eq_2(x1))
exists p1 x1 x2 x3.((x1 = x2) & Time(x2,x3) & n_indoor(x3) & n_people(x2) & card_eq_2(x2) & r_just(x2))