I took the index on the words, transformed the selection to binary, added three zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, extra 3 zeros towards the eight digits of the binary and got 00000010011 which interprets to 19 in decimal. https://loanbookmark.com/story18880314/examine-this-report-on-bip39-mnemonic-phrase-tool