I took the index with the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits of your binary and bought 00000010011 which interprets to 19 in decimal. https://nybookmark.com/story20389690/the-greatest-guide-to-seed-phrase-bip39