A group of people in blue uniforms are walking.
The group of walking people are wearing blue uniforms.
To be "in" blue uniforms means to be wearing them.
exists e1 s1 x1 x2 x3.(Actor(e1,x1) & v_walk(e1) & of(x1,x2) & in(x2,x3) & n_uniform(x3) & a_blue(s1) & Theme(s1,x3) & n_people(x2) & n_group(x1))
exists e2 e1 s1 x1 x2 x3 x4.(n_group(x1) & Theme(e2,x4) & Actor(e2,x1) & v_wear(e2) & n_uniform(x4) & a_blue(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_people(x3) & (x1 = x2))