SWI-Prolog -- Conversion predicates

Conversion of (parts of) an association list to lists is possible with:

[det]assoc_to_list(+Assoc, -Pairs): Translate Assoc to a list Pairs of Key-Value pairs. The keys in Pairs are sorted in ascending order.
[det]assoc_to_keys(+Assoc, -Keys): True if Keys is the list of keys in Assoc. The keys are sorted in ascending order.
[det]assoc_to_values(+Assoc, -Values): True if Values is the list of values in Assoc. Values are ordered in ascending order of the key to which they were associated. Values may contain duplicates.