code: function splitWord (word) {
    Util.assert(word);
  
    if (word.length < MAX_SAMPLE_SIZE) {
      return [word];
    }
  
    let chunks = [];
    for (let ii = 0; ii < word.length - MAX_SAMPLE_SIZE + 1; ++ii) {
      chunks.push(word.substring(ii, ii + MAX_SAMPLE_SIZE));
    }
    return chunks;
  }
docs: split word into three letter (or less) pieces