For people who played around with vanity keys and rana, is any prefix/suffix combination valid, withing the bech32m character set?

I've been running rana for a week now, but haven't found a key and I'm wondering if my prefix+postfix combination is not in the realm of valid encodings.

nostr:npub1qqqqqqqx2tj99mng5qgc07cgezv5jm95dj636x4qsq7svwkwmwnse3rfkq

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Discussion

You cannot use "1", "b", "i" and "o". *

But if I'm not wrong Rana stops you upfront if you try an incompatible prefix.

How long is it?

*Reference: https://en.bitcoin.it/wiki/BIP_0173

Try specifying multiple matches on the same command line, including some easier ones, to see if it's matching anything.