A crowd of people walking the street with Santa.
A crowd of people walking the street with Obama.
If they are walking with Santa, they cannot be walking with Obama at the same time.
exists e1 x1 x2 x3 x4 x5.(ne_geo_santa(x5) & n_street(x4) & a_topic(x1) & of(x1,x2) & with(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2 x3 x4 x5.(ne_geo_obama(x5) & n_street(x4) & a_topic(x1) & of(x1,x2) & with(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_crowd(x1))