# Duplicatef index value due to duplicated value in lost

**URL:** <https://forum.dynamobim.com/t/duplicatef-index-value-due-to-duplicated-value-in-lost/62603>\
**Category:** Revit\
**Tags:** revit, dynamo\
**Created:** [April 7, 2021, 4:38am UTC](https://forum.dynamobim.com/t/duplicatef-index-value-due-to-duplicated-value-in-lost/62603 "2021-04-07T04:38:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ali.almurshed](https://avatars.discourse-cdn.com/v4/letter/a/a6a055/32.png) [@Ali.almurshed](https://forum.dynamobim.com/u/Ali.almurshed)\
**Post date:** [April 7, 2021, 4:38am UTC](https://forum.dynamobim.com/t/duplicatef-index-value-due-to-duplicated-value-in-lost/62603/1 "2021-04-07T04:38:22Z")

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Hi there:

How I can fix duplicated index value due to duplicated items in list?

For example:

List:  
0 1  
1 5  
2 1

I’ll have index list as following  
0 0  
1 1  
2 0

Please advice

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<div class="post-metadata">

**Author:** ![\_Vijay](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/_vijay/32/91307_2.png) [@\_Vijay](https://forum.dynamobim.com/u/_Vijay)\
**Post date:** [April 7, 2021, 4:46am UTC](https://forum.dynamobim.com/t/duplicatef-index-value-due-to-duplicated-value-in-lost/62603/2 "2021-04-07T04:46:17Z")

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list unique items ?!

Can explain more please.