F.2.16 library(pairs)
| group_pairs_by_key/2 | Group values with the same key. |
| map_list_to_pairs/3 | Create a Key-Value list by mapping each element of List. |
| pairs_keys/2 | Remove the values from a list of Key-Value pairs. |
| pairs_keys_values/3 | True if Keys holds the keys of Pairs and Values the values. |
| pairs_values/2 | Remove the keys from a list of Key-Value pairs. |
| transpose_pairs/2 | Swap Key-Value to Value-Key. |