public void Add(string word)
{
Count++;
if (word == string.Empty)
{
_section['0'] = NullTrie;
return;
}
var key = word.Length > 0 ? word.Last() : '0';
if (!_section.ContainsKey(key))
{
_section[key] = new EndTrie();
}
_section[key].Add(word.Substring(0, word.Length - 1));
}
static void _Main(string[] args)
{
var t = int.Parse(Console.ReadLine());
var k = 1;
while (k <= t)
{
var n = int.Parse(Console.ReadLine());
var wordsTrie = new EndTrie();
for (int i = 0; i < n; i++)
{
wordsTrie.Add(Console.ReadLine());
}
var answer = wordsTrie.PairOffAndRemove() * 2;
Console.WriteLine($"Case #{k}: {answer}");
k++;
}
}