"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-08 13:02:35.938848
"""

```python
from typing import List, Dict


class FactChecker:
    """
    A class for checking the validity of statements based on predefined facts.
    """

    def __init__(self):
        self.knowledge_base: Dict[str, bool] = {}

    def add_fact(self, statement: str, is_valid: bool) -> None:
        """
        Adds a fact to the knowledge base.

        :param statement: The statement to be checked
        :param is_valid: Whether the statement is considered valid or not
        """
        self.knowledge_base[statement] = is_valid

    def check_fact(self, statement: str) -> bool:
        """
        Checks if a given statement is in the knowledge base and returns its validity.

        :param statement: The statement to be checked
        :return: True if the statement is valid, False otherwise
        """
        return self.knowledge_base.get(statement, False)

    def reason_about(self, statement: str) -> bool:
        """
        Attempts to reason about a statement based on existing facts.

        If the statement or any related part of it exists in the knowledge base,
        its validity is returned. Otherwise, returns False indicating that
        the reasoning was not conclusive due to limited sophistication.

        :param statement: The statement to be reasoned about
        :return: True if a valid fact supports the statement, False otherwise
        """
        for sub_statement in self._split_into_sub_statements(statement):
            if sub_statement in self.knowledge_base:
                return self.knowledge_base[sub_statement]
        return False

    def _split_into_sub_statements(self, statement: str) -> List[str]:
        """
        Splits a statement into smaller parts to reason about it.

        :param statement: The statement to be split
        :return: A list of sub-statements derived from the input statement
        """
        return statement.split(' ')


# Example usage:
if __name__ == "__main__":
    fact_checker = FactChecker()
    fact_checker.add_fact("The sky is blue", True)
    fact_checker.add_fact("Water boils at 100 degrees Celsius", True)

    print(fact_checker.reason_about("Is the sky blue?"))  # True
    print(fact_checker.reason_about("Does water boil at 90 degrees?"))  # False, because it's not in the knowledge base

```

This code implements a basic `FactChecker` class that can add and check facts. The `reason_about` method demonstrates limited reasoning sophistication by checking if any part of a statement is supported by existing facts.