a: x^9 + y^8 = 1
a: x^(9) + y^(8) = 1
b: x^5 + y^4 = 1
b: x^(5) + y^(4) = 1
d(x, y) = x^(33) + y^(30)
e: x^33 + y^30 = 1
e: x^(33) + y^(30) = 1
f: x^3 + y^2 = 1
f: x^(3) + y^(2) = 1
k: a