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© 2016 Viive Pille, Kristel Oha, Mariliis Lauri, Piia Tint, Varje-Riin Tuulik, Viiu Tuulik, Kalju Meigas, published by Latvian Academy of SciencesThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.