One black dog and one mixed color dog run down a hill.
The two dogs know each other.
Sentence 1 does not imply that the two dogs knew each other before running down a hill.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(a_down(s3) & Manner(e1,s3) & Theme(e1,x5) & Actor(e1,x1) & v_run(e1) & n_hill(x5) & n_dog(x3) & of(x3,x4) & n_color(x4) & a_mixed(s2) & Theme(s2,x3) & card_eq_1(x3) & n_dog(x2) & a_black(s1) & Theme(s1,x2) & card_eq_1(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists x1.(n_dog(x1) & card_eq_2(x1) & all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_know(e1))))