Two children step across the top of stones that cut a path across the shallow river.
Children are swimming in the river.
One cannot step across the top of stones and swim in the river simultaneously.
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(n_river(x7) & of(x7,x8) & n_shallow(x8) & n_top(x3) & a_topic(x1) & across(x1,x3) & of(x3,x4) & Theme(e1,x6) & Actor(e1,x5) & v_cut(e1) & across(x6,x7) & n_path(x6) & (x4 = x5) & n_stone(x4) & n_step(x1) & of(x1,x2) & n_child(x2) & card_eq_2(x1))
exists e1 x1 x2.(n_river(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_child(x1))