Many people in formation on a field.
A group in a line outside.
Many people is a group, and a field is always outside.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & on(x2,x3) & n_field(x3) & n_formation(x2) & n_people(x1) & n_quantity(x1))
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & Theme(s1,x3) & a_outside(s1) & (x2 = x3) & n_line(x2) & n_group(x1))