For explanation see w:en:Van Arkel-Ketelaar triangle
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This image has been released into the public domain by its author, Ingoolemo. This applies worldwide.
In some countries this may not be legally possible; if so:
Ingoolemo grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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وصلات
الصفحات التالية تحتوي على وصلة لهذه الصورة: