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Most of the learning material referenced to on this site, and most of the illustrations used, is of third parties. Most of this material is available under conditions specified under the licenses of Creative Commons. The terms of use of the original authors and/or owners are always to be respected, as in all cases intellectual property rights remain with the originator(s) (authors) or owner(s) of the material. A description of or link to the terms of use belonging to specific material can be found in the metadata description of the learning material on this website. We present this information with the utmost care, but we cannot guarantee the completeness and the actuality of this information. A reference to the original sources of the illustrations present on this website can be found under “Acknowledgements”.

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