Bip39 Mnemonic. Hence, to back again up the obtained bitcoin, you would have to transcribe every one of the personal keys created on occasion. Actually, this Answer is rather not comfortable. For words that have only three letters, there is absolutely no 4th letter. For example with the word “increase”, https://directoryvenom.com/listings13099513/bip39-tool-https-linktr-ee-bip39-bip39-mnemonic-things-to-know-before-you-buy