Missing characters in the middle

[Ninjastar82]

Hello, I am new here.
I've been working on it a bit, but I'm still stuck on which settings I can/must use.

I have my bitcoin address and my uncompressed private key in WIF format but there are only 3 characters missing in the middle. How should I set the mask? If it was missing at the end, I would know in the middle, but I don't know.
I hope you can help me.


Greetings Ninjastar82

[marc1n]

https://hashcat.net/wiki/doku.php?id=mask_attack

[lapsikmees]

-1 characters you are missing, example abcde12345 or ?l?u?d etc. Mask your known password, example hash?1?1?1cat