A group of people are sitting on a sofa hugging each other.
A group of people are dancing in the floor.
If one is dancing, one is not sitting at the same time.
exists e1 x1 x2 x3.(all x4.(n_other(x4) -> exists e2.(for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_hug(e2))) & on(e1,x3) & n_sofa(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(n_floor(x3) & in(e1,x3) & Actor(e1,x1) & v_dance(e1) & of(x1,x2) & n_people(x2) & n_group(x1))