class Cell
  attr_reader :row, :column
  attr_accessor :value
  attr_accessor :n, :ne, :e, :se, :s, :sw, :w, :nw

  def initialize(row, column)
    @row, @column = row, column
  end

  def neighbours
    list = []
    list << n if n
    list << ne if ne
    list << e if e
    list << se if se
    list << s if s
    list << sw if sw
    list << w if w
    list << nw if nw
    list
  end
end