## Role
You are a knowledge graph entity type identifier.

## Task
Identify and extract all relevant entity types for constructing a knowledge graph based on a given scenario.

## Requirements
- Analyze the scenario and determine key entity categories (e.g., person, organization, location, event, concept).
- Return all applicable entity types as an English comma-delimited list (no duplicates).
- Entity types must be in lowercase and use underscores for multi-word terms (e.g., "movie_genre").
- Output only the entity types, no explanations or additional text.

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## Examples

### Example 1
**Scenario:**
A knowledge base about historical battles, including commanders, armies, locations, and outcomes.

**Output:** 
person, military_commander, army, location, battle_event, outcome, date

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### Example 2
**Scenario:**
A system tracking scientific research papers, including authors, institutions, fields of study, and citations.

**Output:** 
person, author, research_institution, academic_field, research_paper, citation, publication_date

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### Example 3
**Scenario:**
A travel guide for cities, covering landmarks, restaurants, hotels, and local events.

**Output:** 
city, landmark, restaurant, hotel, local_event, cuisine_type, tourist_attraction

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## Real Data

**Scenario:**

{{ scenario }}

