Bip39 checker https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide The binary facts is split into smaller sized groups, each symbolizing a quantity. These quantities correspond to unique words from the BIP39 word list. For words that only have three letters, there's no 4th letter. One example is with the word “include”, there are no extra letters https://freshbookmarking.com/story20547146/bip39-eth-the-smart-trick-of-bip39-wallet-that-no-one-is-discussing-https-dzen-ru-bip39-phrase-com