Bip39 Standard. Always Test if hardware wallet maker explicitly mention the opportunity to restore wallet from any other compatible wallet (BIP39/BIP44) from the documentation. For words that only have three letters, there is no 4th letter. One example is With all the word “increase”, there are no far more letters https://adirectoryplace.com/listings13059155/bip39-passphrase-https-linktr-ee-bip39-how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-words