private static IGrid ClearRange(Point p, NumericValue value, IGrid newGrid)
{
foreach (var rangeP in new Range(p))
{
if (newGrid[rangeP].IsDefined)
{
continue;
}
newGrid = newGrid.ExcludeValueFromCell(rangeP, value);
if (newGrid[rangeP].IsDefined)
{
newGrid = ClearRange(rangeP, newGrid[rangeP].Value, newGrid);
}
}
return newGrid;
}