I took the index in the words, converted the selection to binary, included a few zeros, calculated the sha256 digest, took the first Element of the hexadecimal to convert it to binary, added 3 zeros to the eight digits on the binary and obtained 00000010011 which interprets to 19 in https://socialdummies.com/story3789478/new-step-by-step-map-for-ledger-seed-phrase-bip39