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Consider a coding scheme as the following
input: 00 => output: 00000000 (codeword 0)
input: 01 => output: 01010101 (codeword 1)
input: 10 => output: 10101010 (codeword 2)
input: 11 => output: 11111111 (codeword 3)
What is the Hamming distance between codeword 1 and codeword 2