I took the index of the words, converted the selection to binary, added a few zeros, calculated the sha256 digest, took the initial part of the hexadecimal to convert it to binary, included a few zeros for the 8 digits of your binary and received 00000010011 which translates to 19 https://social-medialink.com/story4086298/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator