The sky is blue
The sky is the same color as squirtle
The sky being blue implies it's the same color as squirtle.
exists s1 x1.(n_sky(x1) & Theme(s1,x1) & a_blue(s1))
exists p1 s1 x1 x2.(n_color(x2) & a_same(s1) & Theme(s1,x2) & n_sky(x1) & exists x3.((x1 = x2) & as(x2,x3) & n_squirtle(x3)))