I took the index of your words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to transform it to binary, added 3 zeros into the 8 digits of your binary and received 00000010011 which interprets to 19 in decimal. https://guidemysocial.com/story4389935/5-simple-techniques-for-bip39-seed-phrase