For words that only have three letters, there is no 4th letter. As an example with the word “incorporate”, there aren't any much more letters Later on and thus should be the word "increase". The word “addict” is while in the BIP39 wordlist but you might have utilised “addi” for https://classifylist.com/story20570043/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition