I took the index from the words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, added a few zeros towards the 8 digits of the binary and got 00000010011 which interprets to 19 in https://bookmarkgenius.com/story18709454/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting