I took the index on the words, transformed the selection to binary, extra a few zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, added 3 zeros on the eight digits on the binary and acquired 00000010011 which translates to 19 https://bookmarkdistrict.com/story18709221/facts-about-bip39-seed-phrase-word-list-revealed