---
title: "prag-silver-gate — Mova code model"
description: "Mova code model of prag/src/silver.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/prag/src/silver.rs.groupant/gate.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# prag-silver-gate

The groupant beside prag/src/silver.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:** [`prag/src/silver.rs`](https://github.com/ElamurAI/mova-free/blob/main/prag/src/silver.rs)
- **source SHA-256:** `adf915c8d5e9059d…`
- **covers:** Ignore empty/fence lines; nonnumeric first field increments junk. Extra 0/>N or duplicate in-range number rejects entire batch before schema/voice decisions. Otherwise visit 1..N: missing/schema/voice errors reject that item, good labels enter ordered map. (bytes 5652–8423)
- **part of:** [prag-silver](https://md.groupants.elamur.ai/free/en/mova/prag/src/silver.rs.groupant/)
- **repository folder:** [`prag/src/silver.rs.groupant/gate.groupant`](https://github.com/ElamurAI/mova-free/tree/main/prag/src/silver.rs.groupant/gate.groupant)
- **repository commit:** `48f2e6f74146`

> **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 |
|---|---|---|---|
| `prag-silver-gate-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `prag-silver-gate-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `prag-silver-gate-specialization` | silver_gate_projection | partial source model | [specialization](#specialization) |

## Model text


### model

## prag-silver-gate

### forward
Ignore empty/fence lines; nonnumeric first field increments junk. Extra 0/>N or duplicate in-range number rejects entire batch before schema/voice decisions. Otherwise visit 1..N: missing/schema/voice errors reject that item, good labels enter ordered map.

### invariant
Batch rejection is one None bad entry and empty ok. Junk alone does not reject. Tale forbids voice none; unquoted Tatoeba forbids non-none; Gum has no voice restriction; quoted Tatoeba bypasses source voice gate.

### cost
O(B+N log N) time, O(B+N) row/error storage; schema parsing additional per-row text cost.

### behavior-complement
Duplicate-number acceptance is excluded, as is rejecting an unrelated valid item due only to missing neighbor. Treating Gum voice policy as Tale silently would change existing semantics. Universe: bounded supplied inputs and candidate observable outputs at this source revision. Partial source-derived inner exclusions with finite witness evidence; unsampled semantics remain unknown.

### reverse-reconstruction
Same accepted labels can come from permuted answer lines and ignored fences/junk; whole-batch failure can have duplicate, extra or both causes. Preserve reason/junk observations in fibers. Target is all x in the stated domain with F(x)=y, without unique recovery or an implemented complete solver.

### specialization
Error precedence: alignment ambiguity dominates schema/voice. Removing duplicate detection compiles and fails gates_partition_numbers_and_keep_junk_separate.

### composition
Children share source identity. Preserve frame indices through alignment/link mapping and batch references through prompt/gate numbering. Independent marginal inverses can lose shared correlations; overlap costs are counted once.

### checks
Six fbench and five silver wave16_models tests: finite canonical role oracle, independent ten-role counts, old-code witnesses and compiled controls. See receipts at file root.

### epoch-memory
2026-10-30: prospective inspection predicted predecessor defects and duplicate-edge recall inflation. Three old-code witnesses confirm these. Valid adjacency and unique links retain semantics. No score assertions or deduplication introduced. Historical metrics retain original semantics.

### limitations
Partial syntax is not expanded semantic AST; macros opaque. Scoped models and finite observations, not full-file verification or proof. No live parser, teacher, corpus, filesystem aggregate, GPU, full course, speed or approximation-cap claim. External effects and resource-extreme malformed inputs remain unexecuted.

### evidence

#### Evidence scope

See root receipts.md for source and raw-log hashes. Pure supplied fixtures only; effects are source inspected.