---
title: "world-qud-preparation — Mova code model"
description: "Mova code model of world/src/qud.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/world/src/qud.rs.groupant/preparation.groupant/"
---
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# world-qud-preparation

The groupant beside world/src/qud.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

## Facts

- **kind:** groupant_fragment
- **status:** partial source bound model
- **source:** [`world/src/qud.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/qud.rs)
- **source SHA-256:** `68ab6b4d5bfabd85…`
- **covers:** Source scope preparation; see model.md for functions and dependency limits. (bytes 5864–7948)
- **part of:** [world-qud](https://md.groupants.elamur.ai/free/en/mova/world/src/qud.rs.groupant/)
- **repository folder:** [`world/src/qud.rs.groupant/preparation.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/qud.rs.groupant/preparation.groupant)
- **repository commit:** `855da7bd4a7b`

> **Implementation material.** A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

## Components

| component | label | where |
|---|---|---|
| **approximant** | partial source model | [forward](#forward) |
| **ast** | partial | `../syntax.json` |
| **composition** | partial source model | [composition](#composition) |
| **cost** | partial source model | [cost](#cost) |
| **descriptant** | partial source model | [epoch-memory](#epoch-memory) |
| **invariant** | partial source model | [invariant](#invariant) |
| **tests** | partial source model | [checks](#checks) |

## Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

| id | type | label | where |
|---|---|---|---|
| `world-qud-preparation-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `world-qud-preparation-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `world-qud-preparation-first-choice` | constraint_relation | partial source model | [first-choice](#first-choice) |
| `world-qud-preparation-projection-loss` | constraint_relation | partial source model | [projection-loss](#projection-loss) |

## Model text


### forward

Content excludes LIGHT, wh and auxiliary/copular tokens. Listed pronouns resolve to last subject. First head-zero root, first subject child and first wh token determine metadata; sets lose multiplicity. Last updates only after tracking.

### invariant

Content/words contain no multiplicities; first root/subject/wh choices retain token order. LIGHT/aux/cop/wh cannot enter through content alone, although resolved pronouns can add last subject.

### cost

Linear input scan plus ordered-map/set insertion and string comparisons; root cost states composition. No timing claim.

### composition

This fragment shares source and state with its siblings; root composition specifies ordering and latent dependencies. It is not an independent replacement API.

### epoch-memory

Predicted latest eligible and partial persistence; 46,656 bounded histories confirm. Generic-hedge prose overstates implementation: Who+maybe is complete. No production repair or continuous approximation metric proposed.

### checks

Five native tests: 46,656 six-step histories (279,936 transitions), uncertainty interaction, empty-content slot gate, four polarity preimages, ordered givenness. Fragment scopes are defined by source byte ranges; root evidence distinguishes executed helper tests from inspection-only branches.

### behavior-complement

Within the scoped input/output universe, violating first-choice or projection-loss is excluded by the source model. This inner constraint family does not claim a complete complement.

### reverse-reconstruction

Converse retains all inputs compatible with the scoped output and fixed dependencies; projections and discarded candidates generally create multiple antecedents. No single inverse is claimed.

### first-choice

Permuting equal lemma sets can change first root/wh; no semantic tree validation.

### projection-loss

Duplicate content and surface variants collapse; reasons may retain pronoun forms.