I took the index with the words, transformed the selection to binary, extra 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, extra a few zeros into the eight digits of the binary and received 00000010011 which interprets to 19 in https://socialwoot.com/story21370747/little-known-facts-about-bip39-seed-phrase-list