"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-07 13:08:57.909006
"""

```python
from typing import List, Dict

class ReasoningEngine:
    """
    A basic reasoning engine designed to solve problems with limited reasoning sophistication.
    """

    def __init__(self):
        self.knowledge_base: Dict[str, str] = {}

    def add_fact(self, fact: str) -> None:
        """
        Add a fact to the knowledge base.

        :param fact: A string representing a fact.
        """
        if fact not in self.knowledge_base:
            self.knowledge_base[fact] = "unknown"

    def query(self, question: str) -> str:
        """
        Query the knowledge base for an answer based on the given question.

        :param question: A string representing a question to be answered.
        :return: The response or answer from the knowledge base.
        """
        return self.knowledge_base.get(question, "I don't know that.")

    def infer(self) -> None:
        """
        Infer conclusions based on existing facts in the knowledge base.

        This is a simple example where if A implies B and we know A, then we can conclude B.
        """
        for fact, status in self.knowledge_base.items():
            if "A" in fact and status == "known":
                conclusion = fact.replace("A", "B")
                self.add_fact(conclusion)

def example_usage() -> None:
    """
    Example usage of the ReasoningEngine class to demonstrate its functionality.
    """
    engine = ReasoningEngine()
    engine.add_fact("A is true")  # Add a simple known fact

    print(engine.query("Is A true?"))  # Should return "known"

    engine.infer()  # Infer that B should be true based on the rule provided
    print(engine.query("Is B true?"))  # Should infer and return "unknown" or "known"

if __name__ == "__main__":
    example_usage()
```

This code provides a basic reasoning engine capable of adding facts, querying them, and making simple inferences. The `example_usage` function demonstrates how to use the ReasoningEngine class.