I took the index in the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, additional a few zeros towards the eight digits of your binary and bought 00000010011 which interprets to 19 in https://whitebookmarks.com/story18861981/considerations-to-know-about-bip39-seed-phrase-generator