Bip39 all words https://www.symbaloo.com/mix/bookmarks-xfkm Checksum generation: A checksum is created from this entropy applying SHA-256 hashing, which can help confirm the mnemonic's integrity later. For words that only have 3 letters, there isn't a 4th letter. For example Using the word “increase”, there won't be any additional letters Later on https://sparxsocial.com/story10588780/bip39-vocabulary-an-unbiased-view-of-bip39-2048-words-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw