One blue and one green water slide.
a couple of water slides
There's two water slides
exists s1 s2 s3 x1 x2 x3.(n_slide(x2) & a_.(s3) & Theme(s3,x2) & of(x2,x3) & n_water(x3) & a_green(s2) & Theme(s2,x2) & card_eq_1(x2) & n_blue(x1) & card_eq_1(x1) & subset_of(x2,s1) & subset_of(x1,s1) & a_topic(s1))
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & n_slide(x2) & of(x2,x3) & n_water(x3) & n_couple(x1))