A.29 library(pairs): Operations on key-value lists
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Availability::- use_module(library(pairs)).(can be autoloaded)
Source[det]pairs_keys_values(?Pairs, ?Keys, ?Values)
True if Keys holds the keys of Pairs and Values the values.

Deterministic if any argument is instantiated to a finite list and the others are either free or finite lists. All three lists are in the same order.

See also
pairs_values/2 and pairs_keys/2.
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