I took the index of your words, converted the selection to binary, included a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, extra three zeros to the 8 digits in the binary and bought 00000010011 which interprets to 19 in https://socialwebconsult.com/story4894596/bip39-seed-phrase-mnemonics-generator-an-overview