A question asks: find the hamming distance of the following code:
11111
10101
01010
11100
00011
11001
The answer is 2. How does this work? I thought hamming distance is only between two strings?
The Hamming distance of a code is defined as the minimum distance between any 2 codewords. So, in your case, finding the Hamming distance between any 2 of the listed codewords, no one is less than 2.