"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-06 11:22:10.589261
"""

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


@dataclass
class Fact:
    """Represents a fact to be checked."""
    statement: str
    source: str = ""  # Optional source of the fact


def process_input(statements: List[str]) -> List[Fact]:
    """
    Processes input statements into Facts.

    :param statements: A list of strings representing facts.
    :return: A list of Fact objects.
    """
    return [Fact(statement) for statement in statements]


class FactChecker:
    """
    Checks the validity of factual claims based on predefined knowledge base.
    """

    def __init__(self, knowledge_base: Set[str]):
        """
        Initializes a new FactChecker with a given knowledge base.

        :param knowledge_base: A set of string facts that form the knowledge base.
        """
        self.knowledge_base = knowledge_base

    def check(self, facts: List[Fact]) -> Dict[str, bool]:
        """
        Checks each fact against the knowledge base and returns a dictionary
        with the results.

        :param facts: A list of Fact objects to be checked.
        :return: A dictionary mapping each statement to its validity (True or False).
        """
        results = {}
        for fact in facts:
            # Simple reasoning check: does the statement exist in knowledge base?
            results[fact.statement] = fact.statement in self.knowledge_base
        return results


# Example usage

if __name__ == "__main__":
    # Define a simple knowledge base of known facts
    knowledge_base = {"The Earth is round", "Water boils at 100 degrees Celsius"}

    # Process input statements into Facts
    input_statements = ["The Moon orbits the Earth", "The Sun is larger than Jupiter"]
    facts = process_input(input_statements)

    # Create a FactChecker with the knowledge base
    fact_checker = FactChecker(knowledge_base)

    # Check each fact and print results
    check_results = fact_checker.check(facts)
    for statement, valid in check_results.items():
        print(f"{statement}: {'valid' if valid else 'invalid'}")
```

This code snippet creates a basic `FactChecker` class that can validate the validity of given facts against a predefined knowledge base. It includes example usage and type hints to ensure clear understanding and proper usage.