To limit the number of rows returned after a GROUP BY in an SQL query, you can use the LIMIT keyword, which is applicable to most databases like MySQL, PostgreSQL, and SQLite. Here's a generic example of using LIMIT after GROUP BY:

```sql
SELECT column1, column2, aggregate_function(column3)
FROM table_name
GROUP BY column1, column2
ORDER BY aggregate_function(column3) DESC
LIMIT n;
```

Replace `column1`, `column2`, `column3`, `table_name`, `aggregate_function`, and `n` with the appropriate values for your specific query.

For example, if you want to select the top 10 countries with the highest total sales from a sales_data table, you would write:

```sql
SELECT country, SUM(sales_amount) as total_sales
FROM sales_data
GROUP BY country
ORDER BY total_sales DESC
LIMIT 10;
```

However, if you are using SQL Server, you would use the TOP keyword:

```sql
SELECT TOP 10 country, SUM(sales_amount) as total_sales
FROM sales_data
GROUP BY country
ORDER BY total_sales DESC;
```

For Oracle, you would use ROWNUM:

```sql
SELECT country, total_sales
FROM (
  SELECT country, SUM(sales_amount) as total_sales
  FROM sales_data
  GROUP BY country
  ORDER BY total_sales DESC
)
WHERE ROWNUM <= 10;
```
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence