Two people in blue shirts are outside with a bullhorn.
The people are in white shirts
The people can not be in white shirts if they were previously in blue shirts
exists s1 s2 x1 x2 x3.(with(s2,x3) & n_bullhorn(x3) & Theme(s2,x1) & a_outside(s2) & in(x1,x2) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))
exists p1 x1.(n_people(x1) & exists s1 x2.(in(x1,x2) & n_shirt(x2) & a_white(s1) & Theme(s1,x2)))