Multiple error detection/correction using the Nordstrom-Robinson code

The non-linear Nordstrom-Robinson code of length 16 and minimum distance 6 has twice the codewords of any 16-bit linear code. The NR code is handled as though it were a linear code over Z/sub 4/ (the integers mod 4). Z/sub 4/ linearity is used here to evaluate the NR code itself along with the Hamming code and a (12, 8) used to detect 2-bit adjacent errors over 4-bit symbols.