I took the index in the words, transformed the selection to binary, extra a few zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, extra 3 zeros to the eight digits on the binary and bought 00000010011 which interprets to 19 https://ztndz.com/story21846065/bip39-phrase-generator-can-be-fun-for-anyone