A colorful parade led by a man carrying a red flag.
The flag is triangular.
We can't know for sure what the shape of the flag is, it may not be triangular.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Actor(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_carry(e2) & n_flag(x5) & a_red(s2) & Theme(s2,x5) & (x3 = x4) & n_man(x3) & Theme(e1,x2) & v_lead(e1) & (x1 = x2) & n_parade(x1) & a_colorful(s1) & Theme(s1,x1))
exists s1 x1.(n_flag(x1) & Theme(s1,x1) & a_triangular(s1))