Two bicyclists are mending a bicycle on the sidewalk at night.
Two bicyclists are running over a hill while carrying their bicycles.
People cannot mend a bicycle while running and carrying it.  It is not possible to be on a sidewalk and running over a hill simultaneously.
exists e1 x1 x2 x3 x4.(n_sidewalk(x3) & at(e1,x4) & n_night(x4) & Theme(e1,x2) & Actor(e1,x1) & v_mend(e1) & on(x2,x3) & n_bicycle(x2) & n_bicyclist(x1) & card_eq_2(x1))
exists e1 e2 x1 x2 x3.(while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_carry(e2) & n_bicycle(x3) & of(x3,x1) & n_thing(x1) & over(e1,x2) & n_hill(x2) & Actor(e1,x1) & v_run(e1) & n_bicyclist(x1) & card_eq_2(x1))