Two black-haired boys are squatting on the ground while holding handfuls of marbles.
On the ground holding group meeting.
Marbles are not needed for a group meeting.
exists e1 e2 s1 x1 x2 x3 x4.(n_ground(x2) & while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_hold(e2) & of(x3,x4) & n_marble(x4) & n_handful(x3) & on(e1,x2) & Actor(e1,x1) & v_squat(e1) & n_boy(x1) & a_black-haired(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4 x5.(n_ground(x2) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & n_meeting(x4) & of(x4,x5) & n_group(x5) & (x2 = x3) & n_event(x1))