Bip39 Generator Some words are shorter than 4 letters, including the word “act”. Other words are more time than 4 letters, for instance “summary”. A single set of mnemonic may be used to create various addresses. This technique of making account was launched in BIP32 & BIP39 long time ago. https://iowa-bookmarks.com/story14302700/bip39-numbers-considerations-to-know-about-seed-phrase-generator