How to unlock ipad

Hello! It so happened that I forgot the password from my icloud for ipad 2. I used to use the ***@icloud.com account from which I’m writing to you, and recently I needed a new account for the ipad and I forgot it without writing it down.

emai from ipad: DN***KNV. Please help me as I can not use it. I can provide photos with a check and a box from ipad!

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