> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Slice Stack Boolean Union

## About this Block

The Slice Stack Boolean Union block joins a list of slice stacks into a single stack. Slice stacks must have a uniform layer height to boolean.

## Example File

Download Example: [Slice Stack Boolean Union](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/slice_stack_boolean_union.ntop)

*This file creates a slice stack of the joined slices of two slice stacks.*

![Slice Stack Boolean Union](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/slice_stack_boolean_union.png)

***

Combine multiple slice stacks into a single slice stack

### Inputs

| Name         | Type                                                                  | Description                   |
| ------------ | --------------------------------------------------------------------- | ----------------------------- |
| Slice stacks | [Slice Stack List](../../../../block-documentation/types/slice-stack) | List of slice stacks to union |

### Outputs

| Type                                                             |
| ---------------------------------------------------------------- |
| [Slice Stack](../../../../block-documentation/types/slice-stack) |