A group of people busy in the kitchen.
busy at kitchen
In the kitchen and at kitchen are two different things.
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 s1 x1 x2.(at(s1,x2) & n_kitchen(x2) & Theme(s1,x1) & a_busy(s1) & n_thing(x1))