Hamming codes
[2^r − 1, 2^r − 1 − r, 3] codes whose columns are all nonzero r-bit vectors; perfect codes.
About 20 minutes6 activities Paper packet
[2^r − 1, 2^r − 1 − r, 3] codes whose columns are all nonzero r-bit vectors; perfect codes.
About 20 minutes6 activities Paper packet