Crack GPG Password

[Liam McCombes]

So, I forgot my GPG password. I hadn't used it for a while and it just
slipped my mind. It's about 20 characters long. I do, however, remember the
first 15 or so characters. Is there any program which I could enter in the
known digits and have it use those to crack the rest? I understand this
process could take a pretty long time but if anyone can help me out, I'd be
really grateful ( and would be less stupid in the future).
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