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How to pack away a neat and untangled strand of christmas lights
Remove the strand's power cord from the main source of power.
Remove any garland, or any obstacle that may interfere with the removal of the lights themselves from the tree.
Take off the strand from the christmas tree, carefully.
They might not come off very easily, as they themselves may be wrapped up between the branches or may be stuck to some of the branches. As you pull the strand off from the tree, let these lay gently in an unused travel path that is free from the movement of any sources of other people.