/// <summary>
/// Initializes a new instance of the Sudoku.Common.Cell class
/// with the specified puzzle alphabet and observer.
/// </summary>
/// <param name="alphabet">The collection of all possible cell values.</param>
/// <param name="cellObserver">The observer of this cell.</param>
public Cell(Alphabet alphabet, ICellObserver cellObserver)
{
_CellObserver = cellObserver;
_RemainingPossibilities = alphabet.Clone();
}
/// <summary>
/// Initializes a new instance of the Sudoku.Common.Cell class
/// with the specified puzzle alphabet.
/// </summary>
/// <param name="alphabet">The collection of all possible cell values.</param>
public Cell(Alphabet alphabet)
{
_RemainingPossibilities = alphabet.Clone();
}