> ## Documentation Index
> Fetch the complete documentation index at: https://docs.brik64.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sequential Composition

> EVA sequential composition.

Sequential composition means one operation feeds the next.

```pcd theme={null}
PC fee_total {
    fn fee_total(amount: i64, fee: i64) -> i64 {
        return MC_00.ADD8(amount, fee);
    }
}
```

## Review Points

* The intermediate value is named.
* The consumer uses the producer's output.
* No hidden global state is needed.
* The return value is explicit.

## Review Guidance

Keep the data path visible. Beta14.1 executable PCD examples use the public
numeric monomer profile; string and crypto monomer flows remain SDK-level or
roadmap examples until release notes list parser support.