Bip39 wiki https://send.now/zchzg5fu4oku As you can see, they're normal words which have been simple to retailer or remember. It is not encouraged to recollect them, but it's considerably much easier than remembering a 64-character-long string of random numbers and letters. For words that have only 3 letters, there's no 4th https://bookmarkfly.com/story20683489/bip39-copyright-bip39-checksum-an-overview-https-linktr-ee-bip39