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The basic idea of these passphrases is that you have a dictionary of D words. You pick N words at random. That’s the whole idea. Example: “overlook-hooey-valance-flood-useless-ladyship”.

Cryptocurrency BIP32 passwords use a 2048 (2^11) list, and use 12-24 words per passphrase. 1Password seems to use a larger list, between 18000-18500 words (2^14.15) and you can pick your length (6-8 is common.) https://github.com/1Password/spg/blob/master/agilewords.go