"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-06 00:58:42.224949
"""

```python
from typing import List, Optional


class FactChecker:
    """A simple fact checker that can validate a list of statements based on predefined knowledge.

    Attributes:
        knowledge_base (List[str]): A list containing factual truths used to verify other statements.
    
    Methods:
        __init__(knowledge_base: List[str]):
            Initializes the FactChecker with a given knowledge base.
        
        is_fact(statement: str) -> bool:
            Checks if a statement is considered a fact based on the knowledge base.

        check_statements(statements: List[str]) -> List[Optional[bool]]:
            Verifies multiple statements against the knowledge base and returns a list of verification results.
    """
    
    def __init__(self, knowledge_base: List[str]):
        self.knowledge_base = knowledge_base

    def is_fact(self, statement: str) -> bool:
        """Check if a single statement is considered a fact.

        Args:
            statement (str): The statement to check.

        Returns:
            bool: True if the statement is in the knowledge base, False otherwise.
        """
        return statement in self.knowledge_base

    def check_statements(self, statements: List[str]) -> List[Optional[bool]]:
        """Verify multiple statements against the knowledge base and returns a list of verification results.

        Args:
            statements (List[str]): A list of statements to verify.

        Returns:
            List[Optional[bool]]: A list where each element is True if the corresponding statement is in the knowledge base, False otherwise.
        """
        return [self.is_fact(stmt) for stmt in statements]


# Example usage
if __name__ == "__main__":
    # Define a simple knowledge base of factual truths
    facts = [
        "The Earth revolves around the Sun.",
        "Water boils at 100 degrees Celsius at sea level."
    ]
    
    fact_checker = FactChecker(facts)
    
    # Check individual statements
    print(fact_checker.is_fact("The Earth revolves around the Sun."))  # Expected output: True
    print(fact_checker.is_fact("Mars is the largest planet."))          # Expected output: False
    
    # Check multiple statements at once
    statements_to_check = [
        "The Earth revolves around the Sun.",
        "Water boils at 100 degrees Celsius at sea level.",
        "Pluto is a star."
    ]
    
    results = fact_checker.check_statements(statements_to_check)
    for statement, result in zip(statements_to_check, results):
        print(f"{statement} -> {result}")
```

This code defines a `FactChecker` class with methods to check individual statements and multiple statements against a predefined knowledge base. It includes docstrings for each method explaining their purpose, arguments, and return values. An example usage is provided at the bottom of the script to demonstrate how to create an instance of `FactChecker` and use it to verify statements.