Creating relationship between 2 sheets of data

Hi,

I have 2 sheets of data, each with a unique key. Lets call them "Problems" and "Fixes"

Now each Problem is unique, however Fixes can apply to multiple problems

Eg,
Problems are:
10,11,12,13

Fixes are:
20, 21, 22, 23

Problem to fix relationship:
10 - 21, 22
11 - 20, 21
12 - 20 ,21, 23
13 - 21

If that makes sense.

So what i want to do is a data dump pulling out all the problems that apply to a certain scenario, and automatically list the fixes next to the problems.

I'm having trouble working out how best to structure this. Any ideas?