What is the difference between 911, 311, 411, etc.?

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What is the difference between 911, 311, 411, etc.?

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Among abbreviated dialing arrangements, “N11” codes are three-digit codes of which the first digit can be any digit other than 1 or 0, and the last two digits are both one. There are only eight possible N11 codes, making N11 codes among the scarcest of numbering resources.