> For the complete documentation index, see [llms.txt](https://docs.finngen.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finngen.fi/working-in-the-sandbox/which-tools-are-available/atlas/detailed-guide/how-to-define-a-cohort-in-atlas/concept-sets/simplify-concept-sets-that-use-standard-code-descendants.md).
# Simplify Concept Sets that use standard code descendants
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This page is a continuation of [Create concept set using standard-code descendants](/working-in-the-sandbox/which-tools-are-available/atlas/detailed-guide/how-to-define-a-cohort-in-atlas/concept-sets/selecting-descendants-for-a-concept-set-in-atlas.md) tutorial.
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[Including descendants](/working-in-the-sandbox/which-tools-are-available/atlas/detailed-guide/how-to-define-a-cohort-in-atlas/concept-sets/selecting-descendants-for-a-concept-set-in-atlas.md) may lead to a large number of standard codes having no record counts (RC).
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If you include only descendants with record counts (RC) then this will give the same result but decreases the number of included codes and simplifies the Concept Set.
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### Simplify Concept Set
The following example shows how to simplify a Concept Set using standard code-descendants using the **Included Concepts** and **Concept Set Expression** page.
* On the **Included Concepts** page, order the codes by record count 
* Select all codes with record count (RC) > 0 using the **Id** column checkbox 
* Scroll to the bottom of the page and click the **Add to Concept Set** button. Codes with RC > 0 are now included in the Concept Set.
* On the **Concept Set Expression** page, select all codes with descendants using the **Id** column checkbox 
* Scroll to the bottom of the page and click the **Remove Selected** button.
The Concept Set now only contains codes with a record count (RC) > 0. All standard codes without records (107 codes in this example) have been removed from the Concept Set.