The vertices are positioned along the meridian and anti-meridian, having latitude values that are equal in magnitude but opposite sign.
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This question has appeared on the real examination, you can find the related countries below.
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Austro Control24
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France14
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Germany14
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Sweden7
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Luxembourg4
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Malta4
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Portugal4
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Denmark3
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Norway3
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Poland3
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Switzerland3
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Greece2
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Hungary2
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Latvia2
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Romania2
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Serbia2
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Finland1
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Iceland1
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Ireland1
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Netherlands1