S_1 = (2.02, 1.82)
B = (4.92, 3.08)
k_1 = Circle(S_1, B)
C = Point(k_1)
p = Tangent(C, k_1)
S_2 = (1.08, 1.82)
E = (2.3, 2.14)
k_2 = Circle(S_2, E)
g, h = Tangent(p, k_2)
F = Intersect(k_2, g, 1)
i = Line(F, C)
G = Intersect(k_2, h, 1)
j = Line(G, C)
H = Intersect(k_2, i, 2)
I = Intersect(k_2, j, 2)
k = OrthogonalLine(C, p)
l = LineBisector(I, C)
m = LineBisector(H, C)
S_4 = Intersect(k, m)
k_4 = Circle(S_4, C)
S_3 = Intersect(k, l)
k_3 = Circle(S_3, C)
a = 0 (slider from 0 to 6, step 1)