Two children sitting on a teeter totter.
Two children sit across from one another.
Two people sitting on a teeter totter would typically sit across from one another.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_totter(x3) & of(x3,x4) & n_teeter(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists e1 s1 s2 x1 x2.(from(e1,x2) & n_thing(x2) & card_eq_1(x2) & a_another(s2) & Theme(s2,x2) & a_across(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_child(x1) & card_eq_2(x1))