Bip39 vs https://www.giantbomb.com/profile/blathayqvn/ Although it takes advantage of BIP32 system you are able to still import BIP39 seeds into Electrum wallet. Also apart from BIp32 There may be BIP44 version which some wallet use for the era of seeds. For words that have only 3 letters, there is no 4th https://bookmarkindexing.com/story20120707/bip39-to-slip39-new-step-by-step-map-for-bip39-word-list-txt-https-linktr-ee-bip39