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Given tuples [a,b,c,m] and a target, return indices where ((a^b % 10)^c) % m equals target — the core challenge is evaluating this double modular exponentiation efficiently by using modular exponentiation and exponent reduction (e.g., digit cycles or Euler-type reductions) to handle the exponent tower.
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Leetcode 2961. Double Modular Exponentiation
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