A group of children do stretches on colored mats.
A group of children are stretching.
When children do stretches, they are stretching.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x3) & Actor(e2,x1) & v_do(e2) & on(x3,x4) & n_mat(x4) & Theme(e1,x4) & v_color(e1) & n_stretch(x3) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_stretch(e1) & of(x1,x2) & n_child(x2) & n_group(x1))