A children's choir are in blue and red robes.
An old man's choir in blue and green.
If giving specific information about the children's or old man's choir should only be giving information for one.
exists p1 x1 x2.(exists s1 s2 x3.(in(x2,x3) & n_robe(x3) & a_red(s2) & Theme(s2,x3) & a_blue(s1) & Theme(s1,x3)) & n_choir(x2) & of(x2,x1) & n_child(x1))
exists s1 s2 x1 x2 x3.(a_topic(x2) & in(x2,x3) & n_green(x3) & a_blue(s2) & Theme(s2,x3) & n_choir(x2) & of(x2,x1) & n_man(x1) & a_old(s1) & Theme(s1,x1))