I took the index with the words, transformed the selection to binary, additional three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros to the eight digits in the binary and bought 00000010011 which interprets to 19 in https://socialbookmarkgs.com/story19071628/bip39-phrase-generator-can-be-fun-for-anyone