---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