I took the index with the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to transform it to binary, extra 3 zeros to the 8 digits with the binary and received 00000010011 which interprets to 19 in https://hyperbookmarks.com/story19018847/examine-this-report-on-bip39-mnemonic-phrase-tool