I took the index from the words, converted the range to binary, extra a few zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits in the binary and bought 00000010011 which translates to 19 in https://seolistlinks.com/story21005811/bip39-phrase-generator-can-be-fun-for-anyone