I took the index with the words, transformed the amount to binary, additional 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, additional three zeros towards the 8 digits of the binary and received 00000010011 which translates to 19 in decimal. https://socialbuzzfeed.com/story4380782/not-known-facts-about-bip39-english-words