Keystone Bip39 Some words are shorter than four letters, such as the word “act”. Other words are for a longer period than four letters, for instance “abstract”. One particular set of mnemonic can be used to build many addresses. This process of creating account was launched in BIP32 & BIP39 https://gogogobookmarks.com/story18621930/wallet-seed-phrase-generator-rumored-buzz-on-bip39-phrase