...Mercury is a lonely planet and survives in Celestialis™ only when paired. To achieve this pairing, you must complete the boxing in maneuver demonstrated in figure 5. Also, of course, the atmosphere is toxic to you, so you may not pass through Mercury nor the box used to pair them. Notice in the figure that loops may be used to make the corners of the box, but they need not be. The box that pairs the Mercury planets must be a pure quadrilateral. Sometimes the two may be far apart which increases the difficulty.
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