"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-07 19:18:32.483447
"""

```python
from typing import List, Optional

class KnowledgeBase:
    def __init__(self):
        self.knowledge = []

    def add_fact(self, fact: str) -> None:
        """Add a new fact to the knowledge base."""
        self.knowledge.append(fact)

    def find_facts(self, query: str) -> List[str]:
        """Search for facts that match the given query."""
        return [fact for fact in self.knowledge if query.lower() in fact.lower()]

class ReasoningEngine:
    def __init__(self, knowledge_base: KnowledgeBase):
        self.knowledge_base = knowledge_base

    def infer(self, query: str) -> Optional[str]:
        """
        Attempt to reason and answer a query using the available facts.
        
        Args:
            query (str): The question or statement to analyze.

        Returns:
            Optional[str]: The inferred fact if found, otherwise None.
        """
        facts = self.knowledge_base.find_facts(query)
        if len(facts) == 1:
            return facts[0]
        elif not facts:
            return None
        else:
            # Simple majority voting on the most common inference
            from collections import Counter
            counter = Counter(facts)
            max_count, max_inference = counter.most_common(1)[0]
            return max_inference

# Example usage:

knowledge_base = KnowledgeBase()
knowledge_base.add_fact("All mammals are warm-blooded.")
knowledge_base.add_fact("Dogs are mammals.")
knowledge_base.add_fact("Humans are not dogs.")

reasoning_engine = ReasoningEngine(knowledge_base)

query = "Are humans warm-blooded?"
answer = reasoning_engine.infer(query)
print(f"Inference: {answer}")  # Expected output: None, as it's an invalid inference based on the facts

another_query = "What is true about mammals?"
answer = reasoning_engine.infer(another_query)
print(f"Inference: {answer}")  # Expected output: All mammals are warm-blooded.
```