A man on Rollerblades travelling down the sidewalk.
The man is upside down.
A man can not travel down the sidewalk on Rollerblades while being upsidedown.
exists e1 s1 x1 x2 x3 x4.(n_sidewalk(x4) & ne_org_rollerblades(x2) & a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_travel(e1) & (x1 = x3) & on(x1,x2) & n_man(x1))
exists s1 x1.(n_man(x1) & r_upside(s1) & Theme(s1,x1) & a_down(s1))