[Haskell-cafe] Data.Map: Values to keys and keys to values

[Dmitri O.Kondratiev]

Hi,
Data.Map has many great functions, yet I could not find the one that allows
from one map create another map where keys are values and values are keys of
the first one.
Something like:
transMap:: (Ord k, Ord a) => Map k a -> Map a k

Does such function exist?
Thanks!
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