# Scope contrast one tree

**🟢 Beginner · Lesson 34**

unique vs unique_per_conduit in the SAME conduit tree - the side-by-side that makes scope reach click.

## Before you run

Use the [Beginner guide](../../beginner/index.md) for prerequisite concepts. Run from a checkout with Melder installed and Python 3.14 free-threading selected. The collection download includes the level's local helper modules.

## Run the saved script

```bash
python UX_and_AIX_experiences/01_beginner/34_scope_contrast_one_tree.py
```

```powershell
py -3.14t UX_and_AIX_experiences/01_beginner/34_scope_contrast_one_tree.py
```

{download}`Download this collection <../../downloads/beginner-examples.zip>` · [Source on GitHub](https://github.com/Synaptic724/melder/blob/1211e838099a342c9dde48f064b1e772b6060e13/UX_and_AIX_experiences/01_beginner/34_scope_contrast_one_tree.py)

## Public surface

md.Existence.unique vs unique_per_conduit contrast

## Code

```{literalinclude} ../../downloads/01_beginner/34_scope_contrast_one_tree.py
:language: python
:linenos:
```

## Check the outcome

The script contains its own assertions or demonstrated refusal paths. Run it to evaluate those checks against your installed version. The code above is taken directly from the saved file; no run output is invented here.

[More beginner examples](index.md) · [Level guide](../../beginner/index.md)

## Related guides

- [Scopes that nest](../../beginner/scopes.md)

## API contracts

- [Existence](../../reference/api/resolution/existence.md)