How to implement a multi-index dictionary?

Question

Basically I want something like Dictionary, but not (as I\'ve seen here in other question) with the keys in AND, but in OR. To better explain: I

Answer 1

I would implement a data structure with these two dictionaries

Dictionary> dict1;
Dictionary> dict2;

That way if you are given 1 key you have both the value and the other key as well for easy deletes and updates.