A group of people are running a marathon in winter.
The group of people are running a marathon during the summer.
It cannot be winter and summer at the same time.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_run(e1) & in(x3,x4) & n_winter(x4) & n_marathon(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_summer(x4) & n_group(x1) & during(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_run(e1) & n_marathon(x3) & of(x1,x2) & n_people(x2))