- R1: 32 bit fields.
- R2: bits does not continue more than 4. (with one exception of "nexo-blade")
- R3: bit may have one error, but resulting code must follow R2.
- R4: code with two errors would not be a code.
- Two code distance is larger than 4.
- R5: Two code distance is 4, 6, 8 or 10.
- 0x31111624 <- 0x11111624
- 0x11512622 <- 0x11112622