public void Setup()
{
immutableDictionary = ImmutableDictionary.Create <string, int>();
immutableTrieDictionary = ImmutableTrieDictionary.Create <string, int>();
dictionary = new Dictionary <string, int>();
for (int i = 0; i < N; i++)
{
var key = $"{i},{i}";
immutableDictionary = immutableDictionary.SetItem(key, i);
immutableTrieDictionary = immutableTrieDictionary.SetItem(key, i);
dictionary[key] = i;
}
}