Answer 2A
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The Mandelbrot Set Explorer

### ** Answer 2A:**
The only orbit that does not lie in the filled Julia set of
**x**^{2} - 1 is the orbit of seed D, which escapes to
infinity.

In analogy with our coloring scheme for the Mandelbrot set, colored
points are points whose orbit tends to infinity (with the color
telling us how quickly the orbit escapes). Black points have orbits
that do not escape, and so the black points form the filled Julia set.