List B Document I9. The only cause those letters are listed is to make it less difficult for our human brains to read them and possibly memorize our recovery phrase. Whilst easy, storing your phrase digitally improves the danger of hacking. Actual physical storage is usually encouraged. BIP39 Passphrase Generator https://thesocialintro.com/story4545531/list-of-bip39-words-seed-phrase-generator-for-trust-wallet-an-overview