$d,k$ - codes for error detection and correction

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My question may sound a bit strange but I'm trying to find out anything about the $d,k$-codes. I've been give a kind of home task to learn what is d,k-code and how it works. The problem is I can't find anything about such kind of code. After some investigations, I asked my lecturer again about the task and got the same answer: find out what are $d,k$-codes and how they work(he's a bit strange). Now I'm not sure that they exist at, so can you you please help me to understand what this codes are?