For words that only have three letters, there is no 4th letter. For example with the word “increase”, there won't be any a lot more letters Later on and thus needs to be the word "incorporate". The word “addict” is while in the BIP39 wordlist but you would've utilized “addi” https://mysitesname.com/story8666077/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition