A group of people wearing trench coats perform on stage.
People are performing.
if people perform on stage then people are performing
exists e2 e1 s1 x1 x2 x3 x4 x5.(on(e2,x5) & n_stage(x5) & Actor(e2,x1) & v_perform(e2) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_coat(x4) & a_trench(s1) & Theme(s1,x4) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1.(Actor(e1,x1) & v_perform(e1) & n_people(x1))