I took the index with the words, transformed the amount to binary, added 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added a few zeros towards the eight digits of your binary and received 00000010011 which interprets to 19 in https://worldsocialindex.com/story4092479/considerations-to-know-about-bip39-word-list-pdf