fix bug

@@ -84,7 +84,7 @@ class Retriever:
         merged_idx_list = []
         merged_idx_list = []
         merged_x_list = []
         merged_x_list = []
         merged_y_list = []
         merged_y_list = []
-        for text, x0, y0, x1, y1, idx_tuple in value_list:
+        for text, x0, y0, x1, y1, x2, y2, x3, y3, idx_tuple in value_list:
             merged_value_list.append(text) 
             merged_value_list.append(text) 
             merged_idx_list.extend(idx_tuple)
             merged_idx_list.extend(idx_tuple)
             merged_x_list.append(x0)
             merged_x_list.append(x0)
@@ -95,6 +95,10 @@ class Retriever:
                 min(merged_x_list),
                 min(merged_x_list),
                 min(merged_y_list),
                 min(merged_y_list),
                 max(merged_x_list),
                 max(merged_x_list),
+                min(merged_y_list),
+                max(merged_x_list),
+                max(merged_y_list),
+                min(merged_x_list),
                 max(merged_y_list),
                 max(merged_y_list),
                 tuple(merged_idx_list))
                 tuple(merged_idx_list))