Official bip39 list https://ameblo.jp/generate-bip39brooks/entry-12913353546.html Mycelium - A cellular wallet that supports BIP39 seed phrases and it has Sophisticated functions for electric power users. For words that have only three letters, there is not any 4th letter. One example is Along with the word “include”, there are no extra letters Later https://mypresspage.com/story5078559/bip39-12-vs-24-a-secret-weapon-for-bip39-mnemonic-code-converter-tool-https-linktr-ee-bip39