(Solution) - How many end office codes -(2025 Original AI-Free Solution)

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How many end office codes were there pre-1984, when each end office was named by its three-digit area code and the first three digits of the local number? Area codes started with a digit in the range 2?9, had a 0 or 1 as the second digit, and ended with any digit. The first two digits of a local number were always in the range 2?9. The third digit could be any digit.