> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/library-preparation/ampliseq/library-preparation-ampliseq-reference_material-list/000002333.md).
# Plate layouts for Ampliseq Combinatorial Dual (CD) Indexes Sets A, B, C and D
The following table shows the plate layout for Ampliseq CD Indexes Sets A, B, C and D, which are designed for dual indexing. The catalog numbers for these index kits are 20019105 (Set A), 20019106 (Set B), 20019107 (Set C), and 20019167 (Set D).
**AmpliSeq CD Indexes Set A for Illumina**\
**AmpliSeq CD Indexes Set B for Illumina**\
**AmpliSeq CD Indexes Set C for Illumina**\
**AmpliSeq CD Indexes Set D for Illumina**\
The Index Adapters Pooling Guide, linked [here](https://support-docs.illumina.com/SHARE/IndexAdaptersPooling/Content/IndexAdapterPooling.htm), contains this table along with recommended index combinations for low-plexity library pooling.
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #2333), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000002333%20-%20Library%20Preparation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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