Bip39 Compatible Wallet. The seed phrase can be converted to your number which can be used given that the seed integer to a deterministic wallet that generates all the vital pairs used in the wallet. For words that have only 3 letters, there is not any 4th letter. For example https://coolbizdirectory.com/listings13100177/bip39-standard-https-linktr-ee-bip39-bip39-word-list-no-further-a-mystery