Can you solve it? The club sandwich problem

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Can you solve it? The club sandwich problem
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  • 📰 The Guardian
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A multi-layered brain snack

1) A number sandwich is a line of digits such that there is one digit sandwiched between the 1s, two digits sandwiched between the 2’s, three digits sandwiched between the 3’s, and so on. For example, 312132 is a number sandwich with the digits 1,2 and 32) A number club sandwich is a number sandwich in which each digit appears exactly three times.

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