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There are 64 character options for your ID.
>1/64=0.015625
Which means there's a 1.5625% chance to display any given character. Your ID allows 8 characters to be displayed. That means there's a possibility of getting 8 of the same given characters in a row.
>0.015625^8=0.0000000000000035527137
That means there's a 0.00000000000035527137% chance of a given character to reoccur 8 consecutive times.
>0.0000000000000035527137*64=0.00000000000022737368
That means there's a 0.000000000022737368% chance of getting any character reoccurring 8 times in a row.
Even given that there are currently 4060000 posts on /BANT/, the possibility of such an ID already existing on this board is only 0.00009231371%.
Good luck.