> For the complete documentation index, see [llms.txt](https://www.csvpath.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.csvpath.org/getting-started/the-flightpath-data-examples/duplicates.md).

# Duplicates

{% hint style="warning" %}
**Try these examples yourself.** They are built into FlightPath Data. You can download FlightPath Data free from [Microsoft](https://apps.microsoft.com/detail/9P9PBPKZ4JDF) or [Apple](https://apps.apple.com/us/app/flightpath-data/id6745823097) or [Github](https://github.com/dk107dk/flightpath)
{% endhint %}

CsvPath Validation Language makes it easy to find duplicate data in CSV and Excel files. These csvpaths show how you can create validation rules quickly and easily.

<figure><img src="/files/ujhrBnCjmHCmXvQ4l4im" alt=""><figcaption></figcaption></figure>

* [Unique lines by headers](/getting-started/the-flightpath-data-examples/duplicates/unique-lines-by-headers.md)
* [Percent overlapping](/getting-started/the-flightpath-data-examples/duplicates/percent-overlapping.md)
* [Duplicate lines](/getting-started/the-flightpath-data-examples/duplicates/duplicate-lines.md)