For words that have only 3 letters, there's no 4th letter. Such as with the word “increase”, there are no extra letters afterwards and so need to be the word "insert". The word “addict” is inside the BIP39 wordlist but you might have used “addi” for “addict”. Numerous Wallets:In the https://bookmarksoflife.com/story4373622/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator