Im betting something like that
Or maybe it already had a 1 and you added another 1 to make it 11 or added a 2 so it would be 12, and the next would be 123. I go through this with a relative sometimes, but they finally allowed me to set them with a more secure auto generation so they just click a button to log in anymore - or at least on most sites, I've encountered some that prevent any kind of password manager login and they require manual entry.
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