"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-07 08:33:02.888416
"""

```python
from typing import List, Dict


class ReasoningEngine:
    """
    A simple reasoning engine that can evaluate logical expressions based on a set of facts.
    """

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

    def add_fact(self, fact: str, value: bool) -> None:
        """
        Add or update a fact in the knowledge base.

        :param fact: The name of the fact as a string.
        :param value: The boolean value of the fact.
        """
        self.knowledge_base[fact] = value

    def evaluate_expression(self, expression: str) -> bool:
        """
        Evaluate a logical expression based on the facts in the knowledge base.

        :param expression: A logical expression containing AND, OR, and NOT operators along with variables (facts).
        :return: The result of the evaluation as a boolean.
        """
        return eval(expression, self.knowledge_base)

    def is_fact(self, fact: str) -> bool:
        """
        Check if a given fact exists in the knowledge base.

        :param fact: The name of the fact to check.
        :return: True if the fact exists; False otherwise.
        """
        return fact in self.knowledge_base


# Example usage
def main():
    # Initialize the reasoning engine
    reasoning_engine = ReasoningEngine()

    # Add some facts to the knowledge base
    reasoning_engine.add_fact("A", True)
    reasoning_engine.add_fact("B", False)

    # Evaluate an expression using the facts
    result = reasoning_engine.evaluate_expression("(A AND NOT B) OR A")
    print(f"The result of the evaluation is: {result}")

    # Check if a fact exists
    has_fact_B = reasoning_engine.is_fact("B")
    print(f"Does 'B' exist in the knowledge base? {'Yes' if has_fact_B else 'No'}")


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

This code defines a `ReasoningEngine` class that can be used to manage and reason about logical expressions based on known facts. The example usage demonstrates adding facts, evaluating an expression, and checking for the existence of a fact in the knowledge base.