Vesa Antikainen, © e-Oppi Oy

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Vesa Antikainen, © e-Oppi Oy

Vesa Antikainen, © e-Oppi Oy

USDA. Public Domain.

Vesa Antikainen, © e-Oppi Oy

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Vesa Antikainen, © e-Oppi Oy

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Markus Nolf / Wikimedia Commons. CC-BY-SA 3.0

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