"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-06 21:44:50.380034
"""

```python
from typing import List, Dict, Any


class FactChecker:
    """
    A simple fact-checking capability that verifies claims based on a given set of facts.
    """

    def __init__(self):
        self.facts = {}

    def add_fact(self, subject: str, value: bool) -> None:
        """
        Adds or updates a fact for the specified subject.

        :param subject: The subject of the fact.
        :param value: The boolean value representing the truth of the fact.
        """
        self.facts[subject] = value

    def check_fact(self, subject: str) -> bool:
        """
        Checks if the given subject has a known fact and returns its value.

        :param subject: The subject to check for a fact.
        :return: True if the fact is true, False otherwise. Returns None if no such fact exists.
        """
        return self.facts.get(subject)

    def verify_claim(self, claim_statement: str) -> bool:
        """
        Verifies a complex claim statement that may involve multiple facts.

        The claim statement should contain placeholders for subjects and logical operators AND/OR.

        :param claim_statement: A string representing the claim to be verified.
        :return: True if the claim is true according to known facts, False otherwise. Returns None if the claim cannot
                 be verified due to insufficient data or an invalid claim statement format.
        """
        try:
            # Simple claim verification with placeholders and logical operators
            subjects = [subject.strip() for subject in claim_statement.split("AND")]
            truth_value = True  # Start with true assumption

            for subject in subjects:
                fact_value = self.check_fact(subject)
                if fact_value is None:
                    return False  # Return false immediately if any required fact does not exist
                truth_value &= fact_value  # Apply logical AND

            return truth_value
        except Exception as e:
            print(f"Verification failed: {e}")
            return False


# Example usage
if __name__ == "__main__":
    checker = FactChecker()
    checker.add_fact("election_held", True)
    checker.add_fact("voter_registration_open", True)
    checker.add_fact("results_published", False)

    print(checker.verify_claim("election_held AND voter_registration_open"))  # Expected: True
    print(checker.verify_claim("results_published AND election_held"))  # Expected: False
```

This code defines a `FactChecker` class that can add, check, and verify claims based on predefined facts. The `verify_claim` method supports basic logical operations (AND) to handle more complex statements.