A group of people busy in the kitchen.
player playing chess
A group of people busy in the kitchen can't at the same time be one person playing chess.
exists s1 x1 x2 x3 x4.(n_kitchen(x4) & a_topic(x1) & of(x1,x2) & in(s1,x4) & Theme(s1,x3) & a_busy(s1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists x1 x2 x3.(n_chess(x1) & of(x1,x3) & n_playing(x3) & of(x1,x2) & n_player(x2) & a_topic(x1))