Wallace died a wealthy, if somewhat odd, man without any living relatives. He left his money in four different cities for the first four people who could find it. The only clue he left was this poem:

Do not go solo,
Pairs up with a friend,
Though I hasten to add,
I’ll avenge my end.

What are the four cities?

Using just two letters, fill in the blank letters below to make five English words. The letters are not always in the same order and the same letter may of course be used more than once. What are the words?

1. _ N T _ I N _
2. V I _ _ _ R
3. _ H _ _ L
4. _ _ _ K
5. _ _ _