> ## 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.

# Selection Guide

> Choose monomers for BRIK64 PCD candidates.

## Core-First Selection

Use core monomers before extended monomers.

```text theme={null}
MC_00..MC_63 -> preferred default
MC_64..MC_127 -> extended contract candidate
```

## Questions

* Can ordinary PCD arithmetic or branching express this?
* Is a core monomer available?
* Does extended behavior introduce external contracts?
* Can the behavior be bounded with simpler inputs?
* Is the monomer name and arity documented?

If the answer is unclear, do not invent a monomer. Mark the candidate as needing review.