# Record a case with ready values

## Intention

I want to present my facts to an existing rule.

## Incorrect form and why it stays silent

A fact argument is not a computation program.

```text title="Incorrect form"
assert age(p, 17 + 1);
```
That form is rejected with `LDC-E1325`; it does not compute an age.

## Correct form

Below is only a self-contained stand for case inputs; it does not replace a file-based case package.

```law
language "law.core" version "0.2";
package recipes.n.r06 version "0.1.0";
namespace "urn:recipe:n-package:06";

entity Person;
relation age(p: Person, years: Integer);
relation adult(p: Person);
rule Adult strict {
    for p: Person;
    for years: Integer;
    when age(p, years) and years >= 18;
    then adult(p);
}
case PersonCase {
    const p: Person = entity_ref("urn:recipe:n-package:06:p");
    assert age(p, 18);
}
```

## Frozen execution scene

A local distinguishing scene:

| Facts | Question | Answer |
|---|---|---|
| age(p,18) in given | adult(p) | TRUE_ONLY |

```law
test "given value matches" {
    given {
        context {
            legal_time @2026-09-13;
            decision_time @2026-09-13T09:00:00+05:00;
            knowledge_time @2026-09-13T09:00:00+05:00;
            timezone "Asia/Almaty";
        }
        assert age(entity_ref("urn:recipe:n-package:06:p"), 18);
    }
    evaluate truth(adult(entity_ref("urn:recipe:n-package:06:p")));
    expect truth_status == TRUE_ONLY;
}
```

## Counterfactual

`teaches` replaces the value 18 in the case with `17 + 1`: the exact rejection LDC-E1325. Rules in given are forbidden; computation is performed before the fact is presented, or by a program rule.

## Pitfall

A computation in a fact argument does not yield the needed value; it is rejected with LDC-E1325. The fix is to present the ready 18.