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kh-struve: Halde Tetraeder_5
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kh-struve: Halde Tetraeder_6
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kh-struve: Halde Tetraeder_1
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kh-struve: Halde Tetraeder_4
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kh-struve: Halde Tetraeder_3
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kh-struve: Halde Tetraeder_2