c = 2i
is not in the Mandelbrot set, because the
orbit of 0 under x^{2} + 2i
is 0 --> 2i --> -4 + 2i --> 12 - 14i --> -52 -334i -->
... and these complex numbers get larger and larger and tend
to infinity.

EXAMPLE 5:
c = 2i

The orbit of 0 tends
to infinity.

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