What happens if you answered the same blog 3 times thinking you writing on other

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Hello, I thought I was anwering a different blog and realised it was the same blog 3 times over is there a way to delete your answer of the same blog? The other two blogs have been deleted which I did not know? why have them listed if there are deleted and allow people to post to them... any help would be greatly appreciated? Will I be penalized for that? Thanks Unique16