Two children step across the top of stones that cut a path across the shallow river.
Children are walking on stones.
"Children are walking" is the same as "children step across" and we know the children are on top of stones.
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.(on(e1,x2) & n_stone(x2) & Actor(e1,x1) & v_walk(e1) & n_child(x1))