Recover access to USB external encrypted hard disk

I just switched from Ubuntu 20.04 to Ubuntu 24.04.

In 2021, I bought an USB external hard disk and encrypted it.

I flagged "save forever" password so when I needed some files, it will not ask.This was a breeze, but having the ease of not having to type the password every single time, it made me forgot it!!

Unfortunately during the OS reinstall, I forgot I had this external hard disk and I wiped Ubuntu 20.04 in favor of the newer 24.04.

Now I desperately need the files in that hard disk.

I remember the password to be a combination of some words, but I don't remember their order/combination.

Is there something to automate the construction of the password by these smaller words and trying to decrypt it?

For example I know for sure that the password is the union of some substring, say AAA, BBB, CCC, or DDD.

I don't remember if it may be AAABBBCCCDDD or DDDDAAACCCBBBB or BBBAAA.

Thanks!