I took the index in the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, included a few zeros on the eight digits in the binary and obtained 00000010011 which interprets to 19 https://bookmarkzap.com/story18707916/bip39-seed-phrase-mnemonics-generator-an-overview