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In solidity, what is the best way to combine two addresses? I cannot find a consistent pattern for doing this with the address type.

Would the recommended pattern be to convert address to string, concatenate and generate a hash?

Here's the pattern I'm attempting to achieve.

sha3(address1 + address2)

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The hashing functions in Solidity accept a variable number of arguments:

function hashTwoAddresses(address a, address b) pure returns (bytes32)
{
    return sha256(a, b);
}

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