Three ballerinas perform an arabesque on stage, while another participant looks on.
The ballerina's are practicing for a recital.
Performing  an arabesque on stage does not mean they are practicing.
exists e1 p1 x1 x2 x3 x4.(n_participant(x4) & exists e2 p2 x5.(exists s1.(Theme(s1,x5) & a_on(s1)) & Topic(e2,p2) & Actor(e2,x5) & v_look(e2) & n_participant(x5) & -(x5 = x4)) & while(e1,p1) & on(e1,x3) & n_stage(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_arabesque(x2) & n_ballerina(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(n_'s(x1) & of(x1,x2) & n_ballerina(x2) & for(e1,x3) & n_recital(x3) & Actor(e1,x1) & v_practice(e1))