/**
  * Let's pretend the entire Greek alphabet is only these five.
  */
def getGreekLetters = Seq("alpha", "beta", "gamma", "delta", "epsilon")

/**
  * Reports the total number of Greek letters.
  */
def countGreekLetters = {
  var letters = getGreekLetters

  def subCount = {
    letters = letters.filter(_.contains('e'))

    println("i only like these letters: " + letters)
  }

  subCount

  println(s"There are ${letters.size} Greek letters")
}