Two swans swimming in the water.
There's a male and a female swan swimming.
Two swans in a lake could be other than male and female
exists x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x3) & n_swimming(x1) & of(x1,x2) & n_swan(x2) & card_eq_2(x1))
exists p1 x1 s1 x2 x3 x4 x5.((x1 = x2) & subset_of(x4,x2) & n_swimming(x4) & of(x4,x5) & n_swan(x5) & a_female(s1) & Theme(s1,x4) & subset_of(x3,x2) & n_male(x3))