I took the index of the words, converted the number to binary, added three zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, additional a few zeros towards the 8 digits on the binary and acquired 00000010011 which translates to 19 in https://reallivesocial.com/story4339133/bip39-phrase-generator-can-be-fun-for-anyone