I took the index with the words, transformed the selection to binary, added 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, added 3 zeros for the eight digits with the binary and obtained 00000010011 which translates to 19 in decimal. https://topsocialplan.com/story4474236/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39