reduces values to unpack from

cefr-combined-no-cefr-test.py

@@ -69,7 +69,7 @@ class CefrDataset(datasets.GeneratorBasedBuilder):
             )
             next(csv_reader, None)
             for id_, row in enumerate(csv_reader):
-                (_, prompt, label) = row
+                (prompt, label) = row
                 yield id_, {
                     "prompt": prompt,
                     "label": label