> Not a stupid question at all.  The answer is... You don't; 
> you can use the code to correct one-bit errors OR you can use 
> it to detect
> one- and two-bit errors.  You can't do both, because a 
> two-bit error in one codeword can look identical to a one-bit 
> error in another.
> 

I take it that one could not set bit 7 only when there is a non-correctable
error?

---
James.
 


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