Extracts a set of <key, value> pairs. For
f: keys -> values,
exist so argument
which is per default
values (since these
are going to be retrieved). For
f: values -> keys,
mappings exist, such that
which can also be
keys if the keys
from the object should be retrieved.
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object to extract values from
the set of keys to match the values
returns extracted keys or values from
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