The big city (S). Not-Finite City (also known as The Really Big Apple) is made up of infinitely many avenues running north and south (one avenue for each natural number) and infinitely many streets running east and west (one street for each natural number). A traffic light is placed at every intersection of a street with an avenue. How many traffic lights are there? Does the set of all traffic lights have the same cardinality as the set of natural numbers? If not, explain why. If so, provide a one-to-one correspondence.
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