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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. You cannot iterate over mappings, i.e. you cannot enumerate their keys.
It is possible, though, to implement a data structure on It is possible, though, to implement a data structure on
top of them and iterate over that. For example, the code below implements an 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. the ``sum`` function iterates over to sum all the values.
.. code-block:: solidity .. code-block:: solidity