I took the index on the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, extra three zeros for the eight digits from the binary and obtained 00000010011 which translates to 19 in decimal. https://moodjhomedia.com/story2599434/examine-this-report-on-bip39-mnemonic-phrase-tool