two surfers are riding waves in open water.
Two surfers are competing in the open water against each other.
It cannot be inferred that the surfers are competing against each other in the open water.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_water(x3) & a_open(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_wave(x2) & n_surfer(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(n_water(x2) & a_open(s1) & Theme(s1,x2) & in(e1,x2) & all x3.(n_other(x3) -> against(e1,x3)) & Actor(e1,x1) & v_compete(e1) & n_surfer(x1) & card_eq_2(x1))