unique-words-in-passphrase.js

function onlyUniqueWords(string) {
  return string.split(' ').reduce(function (arr, word) {
    if (!arr) return arr;
    if (arr.indexOf(word) > -1) return false;
    return arr.concat(word);
  }, []);
}

var passPhrases = `pphsv ojtou brvhsj cer ntfhlra udeh ccgtyzc zoyzmh jum lugbnk
...
juo pmiyoh xxk myphio ogfyf dovlmwm moevao qqxidn`.split("\n");

console.log(passPhrases.map(onlyUniqueWords).filter(Boolean).length);