For words that have only 3 letters, there is not any 4th letter. For example with the word “increase”, there won't be any a lot more letters Later on and so should be the word "insert". The word “addict” is in the BIP39 wordlist but you would've utilized “addi” for https://pr7bookmark.com/story19030826/ledger-seed-phrase-bip39-no-further-a-mystery