A choir sings outside together.
A choir singing inside the building.
a choir cannot sings outside or inside simultaneously.
exists s1 s2 x1 x2 x3.(Theme(s2,x1) & a_together(s2) & Theme(s1,x3) & a_outside(s1) & (x1 = x3) & n_sing(x1) & of(x1,x2) & n_choir(x2))
exists x1 x2 x3.(n_building(x3) & a_topic(x1) & inside(x1,x3) & n_sing(x1) & of(x1,x2) & n_choir(x2))