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a may be 1 but the concatenation of (a, b1, b2, ...) must be pandigital also; in your example 1 is repeated
Project Euler #170: Find the largest 0 to 9 pandigital that can be formed by concatenating products.
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a may be 1 but the concatenation of (a, b1, b2, ...) must be pandigital also; in your example 1 is repeated