I took the index on the words, transformed the amount to binary, added a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to transform it to binary, extra three zeros into the 8 digits of your binary and bought 00000010011 which translates to 19 in https://mysocialguides.com/story5041338/facts-about-bip39-seed-phrase-github-revealed