A man is cleaning out a fountain while other people are walking around.
The fountain is unattended.
The fountain cannot be unattended and being cleaned out by a man at the same time.
exists e1 p1 s1 x1 x2 x4.(n_people(x4) & exists e2 p2 x3.(exists s2.(Theme(s2,x3) & a_around(s2)) & Topic(e2,p2) & Actor(e2,x3) & v_walk(e2) & -(x3 = x4) & n_people(x3)) & while(e1,p1) & a_out(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_fountain(x2) & n_man(x1))
exists s1 x1.(n_fountain(x1) & Theme(s1,x1) & a_unattended(s1))