"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-07 04:30:20.023818
"""

```python
from typing import List, Dict


class FactChecker:
    """A simple fact-checking system that validates facts against a predefined knowledge base.

    Attributes:
        knowledge_base: A dictionary containing known facts.
    """

    def __init__(self):
        self.knowledge_base = {
            "fact1": True,
            "fact2": False,
            "fact3": True
        }

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

        Args:
            fact: The fact to be checked as a string.

        Returns:
            A boolean indicating whether the fact is true or false based on the knowledge base.
        """
        return self.knowledge_base.get(fact, False)

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

        Args:
            fact: The fact to be added or updated as a string.
            value: The truth value of the fact (True/False).
        """
        self.knowledge_base[fact] = value

    def remove_fact(self, fact: str) -> None:
        """Remove a fact from the knowledge base.

        Args:
            fact: The fact to be removed as a string.
        """
        if fact in self.knowledge_base:
            del self.knowledge_base[fact]


# Example usage
if __name__ == "__main__":
    checker = FactChecker()
    print(checker.check_fact("fact1"))  # Output: True
    checker.add_fact("newFact", True)
    print(checker.check_fact("newFact"))  # Output: True
    checker.remove_fact("fact2")
    print(checker.check_fact("fact2"))  # Output: None (default value for bool is False)
```