var Markov = require("markoff");
var mark = new Markov();

[
  "the quick brown fox jumps",
  "be quick now",
  "now is the time for all good men"
].forEach(function(sentence) {
  mark.addTokens(sentence.split(/\s+/g));
});

console.log(mark.chain(4).join(' '));
// might print something like "be quick brown fox" or "the quick now is"