A group of kids are sword fighting.
Some kids are playing with swords and shields.
Sword fighting does not imply playing with swords and shields.
exists p1 x1 x2.(exists s1 x3.((x1 = x3) & n_fighting(x3) & a_sword(s1) & Theme(s1,x3)) & of(x1,x2) & n_kid(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(with(e1,x2) & subset_of(x4,x2) & n_shield(x4) & subset_of(x3,x2) & n_sword(x3) & Actor(e1,x1) & v_play(e1) & n_kid(x1))