three people wearing mask sitting down
Three people are wearing black masks.
The people could be wearing any color masks, not necessarily black.
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_wear(e2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x4) & v_sit(e1) & (x3 = x4) & n_mask(x3) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_mask(x2) & a_black(s1) & Theme(s1,x2) & n_people(x1) & card_eq_3(x1))