Cant remind myself the email I used while registrating

Hello, I've faced quite a problem as i forgot the login to the eamil I used while signing up on legue, I needed it to get a PBE account. I tohught I'd send a ticket to riot support, but to do so, I need to give them my email, which i forgot... I know in settings i can look up few letters of it but it didnt help me at all. Anyone has a clue how to solve this? Would apretiate any help!
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