Bip39 explained http://www.video-bookmark.com/user/tucanewhmt The binary info is split into smaller sized groups, each representing a amount. These numbers correspond to particular words in the BIP39 word list. For words that have only three letters, there's no 4th letter. For example Using the word “increase”, there isn't any a lot more https://bookmarkmiracle.com/story21709401/bip39-crate-about-bip39-2048-words-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw