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We can also use different counting systems. For each positive number, what is this shortest Roman Numeral Langford List, where the number of line segments between two numbers are counted? Or the shortest Digital Clock Langford List, where the number of LED segments between the two numbers are counted? Or the shortest Coinage Langford List, where the smallest number of US coins to represent that many cents are counted?
You can see all the best known results here.
Submit your answers here.
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