diff --git a/data/QUGS/convert.py b/data/QUGS/convert.py
index 17af789..a04c6b0 100644
--- a/data/QUGS/convert.py
+++ b/data/QUGS/convert.py
@@ -61,9 +61,9 @@ def generate_df_tuples(total_dfs=30, group_size=5, prefix="zzzAD", extension="TX
             group = []
             for i in range(1, 6):         # TODO: shouldnt be hardcoded
                 n = g * 5 + i
-                bottom = i                     # 1, 2, 3, 4, 5
-                b = a + 25                # 26, 27, 28, 29, 30 # TODO: shouldnt be hardcoded
-                group.append((f"{prefix}{n}.{extension}", [a, b]))
+                bottom_end = i                     # 1, 2, 3, 4, 5
+                top_end = bottom_end + 25                # 26, 27, 28, 29, 30 # TODO: shouldnt be hardcoded
+                group.append((f"{prefix}{n}.{extension}", [bottom_end, top_end]))
             result.append(group)
 
     # Add special groups at specified positions (other than beginning)