Bip39 Lib Some words are shorter than 4 letters, like the word “act”. Other words are extended than 4 letters, for instance “summary”. Please make sure to allow recovery from mnemonic phrases which have invalid checksums (or that you don't have the wordlist) When generating your own personal seed phrase, https://bookmarkindexing.com/story18448271/bip39-binary-lookup-table-indicators-on-seed-phrase-generator-you-should-know