# File lib/quiz1/t/solutions/Jamis Buck/lib/cipher.rb, line 45
  def cards=( deck )
    @deck = deck
    @length = @deck.length
    raise "the deck must contain an 'A' joker" unless @deck.include?("A")
    raise "the deck must contain a 'B' joker" unless @deck.include?("B")
  end