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Merge pull request #12842 from aathan/patch-4

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Update mapping-types.rst
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docs/types/mapping-types.rst
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@ -119,7 +119,7 @@ Iterable Mappings
You cannot iterate over mappings, i.e. you cannot enumerate their keys.
It is possible, though, to implement a data structure on
top of them and iterate over that. For example, the code below implements an
``IterableMapping`` library that the ``User`` contract then adds data too, and
``IterableMapping`` library that the ``User`` contract then adds data to, and
the ``sum`` function iterates over to sum all the values.
.. code-block:: solidity