# File lib/libttc.rb, line 168
  def layout
    out_string = ""
    @positions.keys.sort.each do |position|
      out_string << sprintf("%s touches ", @positions[position])
      @positions[position].neighbours.each do |neighbour|
        out_string << sprintf("%s, ", neighbour)
      end
      out_string << sprintf("\n")
    end
    out_string
  end