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Badulla is a major hub in the central hills of Sri Lanka. Any local numbering system is deeply tied to its geography and administrative structure:
None yield prime digit sums. So that fails.
: Residents use the Sri Lankan National Identity Card (NIC) system, which recently transitioned to a 12-digit format starting with the holder's year of birth. Cultural Significance
Thus, the distinct across all pairs are: 1, 2, 3, 4, 5 .