A.22 library(pairs): Operations on key-value lists
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Availability::- use_module(library(pairs)).(can be autoloaded)
Source[det]pairs_keys(+Pairs, -Keys)
Remove the values from a list of Key-Value pairs. Same as pairs_keys_values(Pairs, Keys, _)
ClioPatria (version V3.1.1-21-gb8003bb)