A swan is above water.
A bird is above water.
Both subjects is above water
exists p1 x1.(exists s1 x2.((x1 = x2) & n_water(x2) & a_above(s1) & Theme(s1,x2)) & n_swan(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_water(x2) & a_above(s1) & Theme(s1,x2)) & n_bird(x1))