public void AddEntry(LexiconEntry entry)
{
var firstLetter = entry.Root[0];
LexiconLetter letter;
if (!LettersByAlphabet.TryGetValue(firstLetter, out letter))
{
letter = new LexiconLetter(firstLetter);
LettersByAlphabet.Add(firstLetter, letter);
}
letter.AddEntry(entry);
}
protected virtual void VisitLetter(LexiconLetter letter)
{
VisitEntries(letter.AllEntries());
}