I took the index of the words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, additional three zeros to your 8 digits of your binary and received 00000010011 which interprets to 19 in decimal. https://listfav.com/story20520647/an-unbiased-view-of-bip39-seed-phrase-github