...Earth is your home planet, and you will want to pass through it each time you see it, but only once per Earth. You may pass through along either axis (X) or (Y). You may not pass through using the segments that create a loop. Also, Earth planets can be boxed (like Mercury) in or not, but NEVER should there be more than two Earths per box no matter how big the box. See figure 6 for an example of how to pass through Earth planets.
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