Bill has a problem. He has locked his pin in a strong box and forgotten the combination.

The lock uses all the digits 1 through 6 in some order. He has tried the following three combinations: 4-5-6-1-3-2 which has one digit correct; 6-2-3-4-5-1 which has two digits correct; and 2-3-1-6-4-5 which has three digits correct.

What is the combination?

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