Several people are participating in an athletics class.
A group of people are seated on a couch eating chips
People cannot be in an athletic class and sit on a couch and eat chips simultaneously.
exists e1 s1 x1 x2 x3.(in(e1,x2) & n_class(x2) & of(x2,x3) & n_athletics(x3) & Actor(e1,x1) & v_participate(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4 x5.(on(e1,x3) & n_chip(x3) & of(x3,x5) & n_eating(x5) & of(x3,x4) & n_couch(x4) & Theme(e1,x1) & v_seat(e1) & of(x1,x2) & n_people(x2) & n_group(x1))