A forest lies between two parts of a city. How many unique routes are there to go from the west side to point a in the east side without retracing any portion of the route?
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Most electrical wire is covered in a rubber or plastic coating called insulation. ... The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
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