A: (1, 1, 1)
B: (3, 1, 1)
C: (1, 3, 1)
D: (3, 3, 1)
E: (2, 2, 1 + sqrt(2))
a = Sphere(A, 1)
b = Sphere(B, 1)
c = Sphere(C, 1)
d = Sphere(D, 1)
e = Sphere(E, 1)