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This is Euclid Algorithm.
e.g
a mod b = k * b + c => a mod b = c, where k is an integer and c is the answer
4 mod 2 = 2 * 2 + 0 => 4 mod 2 = 0
27 mod 5 = 5 * 5 + 2 => 27 mod 5 = 2
so your answer is
2 mod 4 = 0 * 4 + 2 => 2 mod 4 = 2