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Need Raphael Turtle Cancel help

So I decided to try learning how to play Raphael today and I need help with his turtle cancels. I get that you can use it to combo after b12 hits, and I was able to do that. I aslo know that he can use it to be plus when restanding the opponent after b123. But people keep saying he can use it after blocked combo strings in order to be plus, is this possible? If it is how do you do it? Any help would be appreciated. Thank you.