val a = new Empty()
  var b = a.incl (new Tweet("Person","Whatever!", 323))
  b = b.incl (new Tweet("A","What!", 324))
  b = b.incl (new Tweet("B","What..!", 332))
  b = b.incl (new Tweet("C","What....!", 21))
  b = b.incl (new Tweet("D","What......!", 52))

  val c = a.incl (new Tweet("Hello","Meh!", 1))

  println
  println ("# All")
  TweetReader.allTweets.foreach(println)

  println
  println ("# Sorted")
  TweetReader.allTweets.descendingByRetweet.foreach(println)

  println
  println ("# Person, A, B, C, D")
  b foreach println

  println
  println ("# Hello")
  c foreach println

  println ("# Hello, Person, A, B, C, D")
  c.union(b) foreach println

  println
  println ("# Hello, Person, A, B, C, D")
  c.union(b).union(c).union(b).union(b).foreach(println)

  println
  println ("# Filtering > 200 retweets")
  TweetReader.allTweets.filter(t => t.retweets > 200).foreach(println)

  println
  println ("# Random test")
  println (c.union(b).mostRetweeted)
  println (c.mostRetweeted)

  println ("# Ordered")
  println (b.descendingByRetweet.foreach(println))

  println
  println ("# Google tweets")
  GoogleVsApple.googleTweets.foreach(println)

  println
  println ("# Apple tweets")
  GoogleVsApple.appleTweets.foreach(println)

  println
  println ("# Trending")
  GoogleVsApple.trending.foreach(println)