I took the index with the words, transformed the variety to binary, included a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, additional 3 zeros on the 8 digits in the binary and received 00000010011 which interprets to 19 in https://bookmark-search.com/story18711646/the-definitive-guide-to-bip39-seed-phrase