I took the index with the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the initial part of the hexadecimal to transform it to binary, included a few zeros on the eight digits of your binary and bought 00000010011 which interprets to 19 https://madbookmarks.com/story18809403/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator