Mounted officer on the sidewalk in front of a crowd.
A mounted officer on a brown horse is in front of a crowd.
A mounted officer does not have to be on a brown horse.
exists s1 x1 x2 x3 x4.(n_sidewalk(x2) & a_topic(x1) & on(x1,x2) & in(x2,x3) & of(x3,x4) & n_crowd(x4) & n_front(x3) & n_officer(x1) & a_mounted(s1) & Theme(s1,x1))
exists p1 s1 s2 x1 x2.(exists x3 x4.(in(x1,x3) & of(x3,x4) & n_crowd(x4) & n_front(x3)) & on(x1,x2) & n_horse(x2) & a_brown(s2) & Theme(s2,x2) & n_officer(x1) & a_mount(s1) & Theme(s1,x1))