"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-07 14:07:54.831830
"""

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

class FactChecker:
    """
    A simple fact-checking tool that verifies statements against a predefined knowledge base.
    """

    def __init__(self, knowledge_base: Dict[str, bool]):
        """
        Initialize the FactChecker with a knowledge base.

        :param knowledge_base: A dictionary where keys are facts and values indicate their truthfulness (True/False).
        """
        self.knowledge_base = knowledge_base

    def verify_statement(self, statement: str) -> bool:
        """
        Verify if a given statement is true based on the knowledge base.

        :param statement: The statement to check.
        :return: True if the statement is verified as true, False otherwise.
        """
        return self.knowledge_base.get(statement, False)

    def check_statements(self, statements: List[str]) -> Set[str]:
        """
        Check a list of statements and return those that are verified as true.

        :param statements: A list of statements to verify.
        :return: A set containing the statements that were verified as true.
        """
        verified_statements = set()
        for statement in statements:
            if self.verify_statement(statement):
                verified_statements.add(statement)
        return verified_statements

    def update_knowledge_base(self, updates: Dict[str, bool]):
        """
        Update the knowledge base with new facts.

        :param updates: A dictionary of new facts and their truthfulness.
        """
        self.knowledge_base.update(updates)


# Example usage:
knowledge = {
    "The Earth is round": True,
    "Water boils at 100 degrees Celsius": True,
    "The moon orbits the Earth": True
}

checker = FactChecker(knowledge)
statements_to_check = ["The Earth is flat", "Water freezes at 0 degrees Celsius", "Pluto is a planet"]

verified_statements = checker.check_statements(statements_to_check)

print("Verified Statements:", verified_statements)
```