Finds applicatins that would be good candiadtes for Twinkl orig

src/twinkl_originals.py

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+import re
+import pandas as pd
+
+def find_book_candidates(df: pd.DataFrame, column: str) -> pd.Series:
+
+    if column not in df.columns:
+        raise KeyError(f"Column '{column}' not found in DataFrame")
+
+    series = df[column].astype(str)
+
+    pattern_books = r'\bbooks?\b'
+    pattern_level = r'\b(ks1|ks2|primary|eyfs|early years|nursery)\b'
+
+    has_books = series.str.contains(pattern_books, case=False, na=False)
+    is_primary = series.str.contains(pattern_level, case=False, na=False)
+
+    
+    return has_books & is_primary
+
+