Two large dogs attempt to bite each other playfully.
The dogs know each other.
Just because two large dogs attempt to bite each other playfully does not indicate that dogs know each other.
exists e1 p1 s1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_attempt(e1) & all s2 x2.((n_other(x2) & a_playfully(s2) & Theme(s2,x2)) -> exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_bite(e2))) & n_dog(x1) & a_large(s1) & Theme(s1,x1) & card_eq_2(x1))
exists x1.(n_dog(x1) & all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_know(e1))))