I took the index in the words, converted the selection to binary, additional a few zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, extra three zeros towards the 8 digits with the binary and received 00000010011 which translates to 19 in https://socialfactories.com/story4412687/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news