text: 'use strict';
  
  var words = require('common-words');
  var _ = require('lodash');
  
  /**
   * Get an array of the 100 most common english words
   */
  
  function common(words) {
    return _.map(words, function(o) {
      return o.word.toLowerCase();
    }).sort();
  }
  
  /**
   * Some common words are excluded, like "the", "an"
   * etc. This is a list of words that we'll exlude
   * from the exclusions.
   */
  
  var reallow = [
    'all',
    'any',
    'day',
    'do',
    'even',
    'first',
    'get',
    'have',
    'how',
    'in',
    'into',
    'just',
    'know',
    'like',
    'look',
    'make',
    'most',
    'new',
    'no',
    'not',
    'now',
    'on',
    'one',
    'only',
    'or',
    'other',
    'out',
    'over',
    'people',
    'say',
    'see',
    'some',
    'take',
    'then',
    'think',
    'time',
    'two',
    'up',
    'use',
    'well',
    'what',
    'when',
    'which',
    'who',
    'year',
  ];
  
  /**
   * Exlude common words
   */
  
  exports.common = _.difference(common(words), reallow);
  
  /**
   * Exclude single letters from keywords.
   */
  
  exports.singleLetters = 'abcdefghijklmnopqrstuvwxzy'.split('');
  