I took the index with the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional a few zeros towards the 8 digits with the binary and got 00000010011 which interprets to 19 in https://bookmarkloves.com/story21049700/bip39-phrase-generator-can-be-fun-for-anyone