A group of girls is sitting in the dance studio.
The girls are all wearing tights.
Just because the girls are in a dance studio, it does not mean they are wearing  tights, they be in some other costume too.
exists e1 x1 x2 x3 x4.(n_studio(x3) & of(x3,x4) & n_dance(x4) & in(e1,x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_girl(x2) & n_group(x1))
exists e1 s1 x1 x2.(n_girl(x1) & a_all(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_tights(x2))