select distinct product_name
from order_details, products, (
    select order_id, count(product_id) as product_number
    from order_details
    group by order_id)t1,(
    select distinct order_id
    from orders, customers
    where orders.customer_id = customers.customer_id
    and country = 'Germany')t2
where t1.product_number < 5
and t1.order_id = t2.order_id
and order_details.order_id = t1.order_id
and products.product_id = order_details.product_id
order by product_name