public void PaintPencilMarksAndHints()
{
foreach (KeyValuePair <Point, Dictionary <int, Hint.Kind> > kvp in pencil)
{
Point p = kvp.Key;
Dictionary <int, Hint.Kind> d = kvp.Value;
int[] ln = d.Keys.ToArray();
Array.Sort(ln);
for (int i = 0; i < ln.Length; ++i)
{
Brush br = ForegroundBrush(d[ln[i]]);
DrawSubcell(br, p.X, p.Y, i + Cells - ln.Length, grid.ToChar(ln[i]).ToString());
}
}
}