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Of course it is not strictly required to participate every month, e.g., if you are on holiday or do not live in Kiel. Practice, however, shows that you should reserve these 2 hours of time per month (= only 0,.26% of your time) because otherwise this special time is tend to drown in day-to-day business. So please feel invited to try to come as often as possible to keep up this fellowship 
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