A group of children are playing on swings.
10 humans
Not all groups are groups of 10.
exists e1 x1 x2 x3.(on(e1,x3) & n_swing(x3) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_child(x2) & n_group(x1))
exists x1.(n_human(x1) & n_date(x1) & a_date_day_10(x1) & a_date_day_10(x1) & a_topic(x1))