I took the index with the words, transformed the selection to binary, extra 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, additional a few zeros to the eight digits in the binary and obtained 00000010011 which interprets to 19 in https://bookmarkangaroo.com/story19588965/considerations-to-know-about-bip39-seed-phrase-generator