Bip39 tool github https://jsbin.com/titaniseko Mycelium - A mobile wallet that supports BIP39 seed phrases and has State-of-the-art features for electrical power customers. For words that have only three letters, there's no 4th letter. By way of example Using the word “incorporate”, there won't be any much more letters Later on https://bookmarkpagerank.com/story20027487/bip39-passphrase-empty-for-none-the-single-best-strategy-to-use-for-bip39-recovery-tool-https-dzen-ru-bip39-phrase-com