One blue and one green water slide.
three water slides
A blue and a green water slide does not make three 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.(n_slide(x1) & of(x1,x2) & n_water(x2) & card_eq_3(x1) & a_topic(x1))