"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-08 11:53:31.438079
"""

```python
from typing import List, Dict

class KnowledgeBase:
    def __init__(self):
        self.knowledge = {}

    def add_fact(self, fact: str) -> None:
        """
        Adds a new fact to the knowledge base.
        
        :param fact: A string representing a factual statement.
        """
        if fact not in self.knowledge:
            self.knowledge[fact] = [True]
        else:
            self.knowledge[fact].append(True)

    def check_fact(self, fact: str) -> bool:
        """
        Checks if the given fact is present and marked as True.
        
        :param fact: A string representing a factual statement to check.
        :return: True if the fact exists in the knowledge base with value True, False otherwise.
        """
        return self.knowledge.get(fact, [False])[0]

    def set_fact(self, fact: str) -> None:
        """
        Sets the state of the given fact as True in the knowledge base.
        
        :param fact: A string representing a factual statement to be marked as true.
        """
        if fact not in self.knowledge:
            self.knowledge[fact] = [True]
        else:
            self.knowledge[fact][0] = True

def reasoning_engine(kb: KnowledgeBase, query: str) -> bool:
    """
    A simple rule-based engine to reason over the knowledge base.
    
    The engine checks for a direct fact or its negation in the knowledge base.
    If neither is found, it returns False.
    
    :param kb: An instance of KnowledgeBase containing factual statements.
    :param query: A string representing a factual statement to check against the knowledge base.
    :return: True if the query can be concluded from the knowledge base, False otherwise.
    """
    # Direct fact match
    if kb.check_fact(query):
        return True
    
    # Negation match - assuming negation is formed by prefixing with 'not_'
    negated_query = f"not_{query}"
    if kb.check_fact(negated_query):
        return False
    
    return False

# Example usage:
kb = KnowledgeBase()
kb.add_fact("It_is_raining")
kb.set_fact("I_have_an_umbrella")

print(reasoning_engine(kb, "It_is_raining"))  # Output: True
print(reasoning_engine(kb, "not_I_have_an_umbrella"))  # Output: False
```

This code defines a simple reasoning engine that operates on a basic knowledge base. The `KnowledgeBase` class manages facts and their truth values, while the `reasoning_engine` function checks if a given fact can be concluded from the knowledge base using a rule-based approach.