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How to the use the online shop?
You can chose the desired topic within the range 'categories' on the left side and click through until you have reached your desired sub category. The number within the round parentheses indicates to you, how many articles are in these sub categories.
The centre of this side also indicates you the sub categories of the 2nd level. Following these links you can easily move to the desired sub category. Don’t miss to click on the pictures; they can be enlarged in 2 steps.