# Create a numbering sequence for key repeated values in a List

**URL:** <https://forum.dynamobim.com/t/create-a-numbering-sequence-for-key-repeated-values-in-a-list/16944>\
**Category:** Lists-Logic\
**Tags:** dynamo\
**Created:** [November 29, 2017, 12:17pm UTC](https://forum.dynamobim.com/t/create-a-numbering-sequence-for-key-repeated-values-in-a-list/16944 "2017-11-29T12:17:34Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Yna\_Db](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/yna_db/32/30641_2.png) [@Yna\_Db](https://forum.dynamobim.com/u/Yna_Db)\
**Post date:** [November 29, 2017, 12:58pm UTC](https://forum.dynamobim.com/t/create-a-numbering-sequence-for-key-repeated-values-in-a-list/16944/2 "2017-11-29T12:58:10Z")

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A screenhot clearly indicating the initial and expected lists could be useful. You can check first what’s already available on this topic and start to experiment from that, see for example:

- [http://dynamoprimer.com/en/06\_Designing-with-Lists/6-3\_lists-of-lists.html](http://dynamoprimer.com/en/06_Designing-with-Lists/6-3_lists-of-lists.html)
- [Dynamo Dictionary](http://dictionary.dynamobim.com/#/Core/List)
- [Enjoy Revit: Examples for All List Actions in DYNAMO](http://plevit1.blogspot.be/2015/01/examples-for-all-list-actions-in-dynamo.html)
- [Managing Lists in Dynamo – landarchBIM](https://landarchbim.com/2016/01/13/managing-lists-in-dynamo/)
- See also if existing discussions can’t help, such as this one for instance:

> [@Matching sublist elements sequentially](https://forum.dynamobim.com/t/matching-sublist-elements-sequentially/14913/5):
>
> It seems that the OOTB nodes can’t do this easily. These ones could help:

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