a group of people on a medal walkway
They are on a grass walkway
They can not be standing on a metal or grass walkway at the same time
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_walkway(x3) & a_medal(s1) & Theme(s1,x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1.(n_thing(x1) & exists x2 x3.(on(x1,x2) & n_walkway(x2) & of(x2,x3) & n_grass(x3)))