To be more clear, let's assume simpler, only number based data:

---HASH KEY----|-VALUE-|
(a)     (b)    |       |
250     50     |  4    |  <- PAIR 1
50     250     |  5    |  <- PAIR 1
47     250     |  1    |  <- PAIR 2
101    250     |  7    |  <- PAIR 3
250     47     |  8    |  <- PAIR 2
250     101    |  9    |  <- PAIR 3
[download]

And i Would like to get following output:

 KEYS   |  a value | b value | total
250  50 |    4     |   5     |   9
47  250 |    1     |   8     |   9
101 250 |    7     |   9     |   16
[download]

I think it's more clear.