Good question. I have been trying to find out the same thing for years. Below are the codes I know from personal experience. I wish I knew the answer to the rest. I contacted the Ohio Lottery once and asked that question. They replied back but refused to release the information....
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them