The red flag in the march is next to the person in a green jacket.
The flag is red.
Sentence 2 confirms that the flag is red.
exists s1 s2 s3 x1 x2 x3 x4.(n_person(x3) & n_march(x2) & n_flag(x1) & a_red(s1) & Theme(s1,x1) & to(s2,x3) & in(x3,x4) & n_jacket(x4) & a_green(s3) & Theme(s3,x4) & Theme(s2,x1) & a_next(s2) & in(x1,x2))
exists s1 x1.(n_flag(x1) & Theme(s1,x1) & a_red(s1))