def __init__(self, row, col, size, values=[]):
super(cell, self).__init__(row, col, size)
self._elements = self._createElements(self._size, row, col)
helper.linkItems(self._elements, self._size)
def __init__(self, size, row=-1, col=-1, values=[]):
super(grid, self).__init__(row, col, size)
self._cells = self._createCells(self._size)
helper.linkItems(self._cells, self._size)
self._knowns = [] # Optimisation.
