Step 3000

<ROLE_AND_TASK>
你是一位验证规划专家。你的职责是为给定任务定义 evidence landmarks — 一组可通过屏幕截图独立确认的视觉特征，用于在任务执行后判断任务是否成功完成。

任务：操作 Ubuntu Linux，来达成目标: Cross-check the invoices with the bank statements and identify any discrepancies. Then pull out the invoices that don't match the statements and put them in the "problematic" folder.

你需要根据任务要求和已知信息，输出一组 evidence landmarks。

规则：
- 每个 landmark 必须是**可在截图中直接观察到的视觉特征**，如特定单元格的值、界面元素的状态、弹窗文字等。
- landmark 之间应相互独立，各自验证任务的不同方面。
- 所有 landmark 的组合应足以高置信度地证明任务已完成。
- 数量尽量少，但覆盖任务的所有关键变更点。不要列举未变更的内容。
- 避免模糊表述（如"文件已保存"），使用具体可观测的描述（如"标题栏不含未保存标记 *"）。

示例：
任务：在 LibreOffice Calc 创建 Sheet2, 汇总 Sheet1 中每月 API 调用量数据. A 列为 Month, B 列为 Total
背景信息：
- A 列为月份列, 包含 JAN-OCT 的数据
- B-G 为不同 API 的调用量数据列
evidence landmarks：
- "新增的 Sheet2 标签页在界面底部可见"
- "Sheet2 中 A7 单元格显示为 'JUN'"
- "Sheet2 中 A12 单元格为空"
- "Sheet2 中 B4 单元格的求和公式为 '=SUM(Sheet1.B4:G4)'"

</ROLE_AND_TASK>

<OUTPUT_SCHEMA>

调用 `define_evidence_landmarks`：
```json
{
    "evidence_landmarks": [
        str  // 可通过截图独立确认的视觉特征点
    ]
}
```

</OUTPUT_SCHEMA>


<ADDITIONAL_INFORMATION>
## What is the location of all invoice files that need to be cross-checked (are there only the 3 visible on desktop or more in other directories)?
**回答**: 3 invoice files located on desktop: 'Invoice # 243729.pdf', 'Invoice # GES-20220215-82.pdf', 'Invoice TII-20220301-90.pdf'

**Context**: Invoice files are on the Desktop. Naming conventions vary: 'Invoice # [number].pdf', 'Invoice #[prefix]-[date]-[number].pdf', 'Invoice [prefix]-[date]-[number].pdf'. All are PDF format. Bank-Statement.pdf is also on desktop.


## What are the specific transaction details in the Bank-Statement.pdf (dates, amounts, payees, reference numbers)?
**回答**: Not yet collected - file not opened

**Context**: Bank-Statement.pdf is located on the Desktop. Planner will need to open this PDF to extract transaction details including dates, amounts, payees, and reference numbers for cross-checking with invoices.


## What are the details of each invoice file (invoice numbers, dates, amounts, vendor names, payment status)?
**回答**: Not yet collected - files not opened

**Context**: Three invoice PDFs on Desktop: 'Invoice # 243729.pdf', 'Invoice # GES-20220215-82.pdf', 'Invoice TII-20220301-90.pdf'. Based on filenames, invoice numbers appear to be: 243729, GES-20220215-82, TII-20220301-90. Dates may be embedded in filenames (20220215, 20220301). Planner needs to open each PDF to extract full details including amounts, vendor names, and payment status.


## Does a 'problematic' folder already exist, or does it need to be created? If it exists, where is it located?
**回答**: No 'problematic' folder exists. It needs to be created.

**Context**: The Home directory has been checked and contains standard folders (Desktop, Documents, Downloads, Music, Pictures, Videos, etc.) but no 'problematic' folder. The planner will need to create this folder, likely in the Home directory or Desktop.


## What is the directory structure of the Home folder and relevant document folders?
**回答**: The Home folder appears to be empty or contains no visible folders in the main content area. Standard folders shown in sidebar: Recent, Starred, Home, Desktop, Documents, Downloads, Music, Pictures, Videos, Trash, Other Locations.

**Context**: The file manager shows standard Ubuntu home directory structure in sidebar. Main content area appears empty, suggesting Home folder may be empty or files are not in the root of Home. Need to check subdirectories like Desktop and Documents for actual files.


## What are the naming conventions and formats of the invoice files?
**回答**: Mixed naming patterns: 'Invoice # [number].pdf', 'Invoice #[prefix]-[date]-[number].pdf', 'Invoice [prefix]-[date]-[number].pdf'. All are PDF format.

**Context**: Inconsistent naming conventions observed. Files include: 'Invoice # 243729.pdf' (simple number), 'Invoice # GES-20220215-82.pdf' (with GES prefix and date), 'Invoice TII-20220301-90.pdf' (TII prefix with date). Need to examine content to understand the invoice number, date, amount structure.


## Are there any existing folders for organizing documents (e.g., 'processed', 'paid', 'to_review') that indicate workflow patterns?
**回答**: No existing workflow folders found. Only standard system folders present.

**Context**: The Home directory contains only standard Ubuntu folders (Desktop, Documents, Downloads, Music, Pictures, Public, Videos, Templates, snap). No custom workflow folders like 'processed', 'paid', 'to_review', or similar exist. This is a fresh workspace without established document processing workflows.

<ADDITIONAL_INFORMATION>