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Letters can slide into each other halfway so that they disappear into thin air. At the same time, they can also do the opposite, extend from nothingness into a letter form. It is not said that these two contiguous actions have to be performed by the same letter. If the first half of the action is performed by one letter, and the other half of the action by another letter, then one letter is swapped for another, and one word can be swapped for another.