Cross-Cap -- from Wolfram MathWorld
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![PDF] Cross-Caps—Boy Caps—Boy Cups | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/8174a77d4dbc5bf048ab7eaf101ee41481c61982/2-Figure2-1.png "PDF] Cross-Caps—Boy Caps—Boy Cups | Semantic Scholar")
PDF] Cross-Caps—Boy Caps—Boy Cups | Semantic Scholar
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