Update formatting.py

formatting.py

@@ -72,26 +72,6 @@ def _limit_steps(steps: List[str], verbosity: float, minimum: int = 1) -> List[s
     return steps[:limit]
 
 
-def _why_line(topic: str) -> str:
-    topic = (topic or "").lower()
-
-    if topic == "algebra":
-        return "Why: algebra works by keeping the relationship balanced while undoing the operations attached to the variable."
-    if topic == "percent":
-        return "Why: percent questions depend on choosing the correct base before doing any calculation."
-    if topic == "ratio":
-        return "Why: ratio questions depend on preserving the comparison and using one shared scale factor."
-    if topic == "probability":
-        return "Why: probability compares successful outcomes to all possible outcomes."
-    if topic == "statistics":
-        return "Why: the right method depends on which summary measure the question actually asks for."
-    if topic == "geometry":
-        return "Why: geometry depends on the relationships between the parts of the figure."
-    if topic == "number_theory":
-        return "Why: number properties follow fixed rules about divisibility, factors, and remainders."
-    return "Why: start with the structure of the problem before calculating."
-
-
 def _extract_topic_from_text(text: str, fallback: Optional[str] = None) -> str:
     low = (text or "").lower()
     if fallback: