Children who are holding their hands up while sitting on a gym floor.
boys and girls holding their hands up
Because there are children doesn't mean they are both boys and girls, the children maybe just boys or just girls.
exists e2 e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & while(e1,e2) & on(e2,x4) & n_floor(x4) & of(x4,x5) & n_gym(x5) & Actor(e2,x2) & v_sit(e2) & a_up(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_hold(e1) & n_hand(x3) & of(x3,x1) & n_thing(x1) & (x1 = x2) & n_child(x1))
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(s1) & a_up(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & n_hand(x4) & of(x4,x1) & n_thing(x1) & (s1 = x3) & subset_of(x2,s1) & n_girl(x2) & subset_of(x1,s1) & n_boy(x1))