2 people putting something in the river.
Two people dumping something the river.
People can put animals in the river not just dumping something.
exists e1 x1 x2 x3 x4.(n_river(x4) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_put(e1) & n_thing(x3) & (x1 = x2) & n_people(x1) & n_date(x1) & a_date_day_02(x1) & a_date_day_02(x1))
exists e1 x1 x2 x3 x4.(n_river(x4) & a_topic(x1) & Time(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_dump(e1) & n_thing(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))