I took the index of the words, transformed the number to binary, extra three zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, additional a few zeros on the eight digits on the binary and obtained 00000010011 which interprets to 19 in https://reallivesocial.com/story4343534/considerations-to-know-about-bip39-seed-phrase-generator