I took the index of the words, transformed the selection to binary, additional 3 zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to transform it to binary, extra three zeros to the eight digits on the binary and obtained 00000010011 which interprets to 19 in https://thesocialvibes.com/story4441640/the-definitive-guide-to-bip39-seed-phrase