fix: added preposition

run.py

@@ -50,7 +50,7 @@ def read_markdown_file(file_path: str, filename: str) -> tuple[str, str, str] |
         filtered_lines = []
         for line in definitions.split("\n"):
             line = line.strip()
-            if line.startswith(("n.", "adj.", "adv.", "v.")):
+            if line.startswith(("n.", "adj.", "adv.", "v.", "prep.")):
                 filtered_lines.append(line)
 
         definitions = "\n".join(filtered_lines)