Two twin pre-teen boys dueling with sticks
Sisters playing with sticks
They can't be both boys and sisters, who would be girls.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_stick(x3) & Actor(e1,x2) & v_duel(e1) & (x1 = x2) & n_boy(x1) & a_pre-teen(s2) & Theme(s2,x1) & a_twin(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_stick(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_sister(x1))