I took the index in the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional a few zeros towards the 8 digits of your binary and got 00000010011 which interprets to 19 in https://thesocialvibes.com/story4322042/a-review-of-bip39-phrase-list