A_{1} = (1.36, -4.72)
B = (13.14, -6.02)
f = Line(A_{1}, B)
S_1 = (7.86, 1.74)
A = (4.92, -0.84)
c = Circle(S_1, A)
a = 0 (slider from 0 to 5, step 1)
C = (7.38, 1.58)
d = Circle(A, C)
f' = Mirror(f, d)
D = Intersect(c, d, 2)
E = Intersect(c, d, 1)
g = Line(D, E)
h, i = Tangent(g, f')
h' = Mirror(h, d)
i' = Mirror(i, d)
S_3 = Center(h')
S_2 = Center(i')