"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-07 18:10:49.082304
"""

```python
from typing import List, Dict

class KnowledgeBase:
    def __init__(self):
        self.knowledge = {}

    def add_fact(self, fact: str) -> None:
        """Add a fact to the knowledge base."""
        if fact not in self.knowledge:
            self.knowledge[fact] = []

    def get_facts(self) -> Dict[str, List]:
        """Get all facts stored in the knowledge base."""
        return self.knowledge

def reasoning_engine(kb: KnowledgeBase) -> str:
    """
    A simple reasoning engine that applies logical rules to derive new conclusions.

    Args:
    kb (KnowledgeBase): The knowledge base containing the facts.

    Returns:
    str: A conclusion derived from the existing facts.
    """
    if 'A' in kb.get_facts() and 'B' in kb.get_facts():
        return "C is true based on A and B"
    
    if 'D' in kb.get_facts() and 'E' in kb.get_facts():
        return "F is true based on D and E"
    
    return "No conclusion can be drawn from the given facts"

# Example usage
if __name__ == "__main__":
    kb = KnowledgeBase()
    kb.add_fact('A')
    kb.add_fact('B')
    print(reasoning_engine(kb))  # Expected output: C is true based on A and B

    kb2 = KnowledgeBase()
    kb2.add_fact('D')
    kb2.add_fact('E')
    print(reasoning_engine(kb2))  # Expected output: F is true based on D and E
```