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A shape with Heesch number 7

Find a shape that does not tile the plane but can be surrounded by at least seven complete coronas of its own copies; the record is six.

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1# Board: A shape with Heesch number 7
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3*Written by the site from the issues and claims, never by hand; times are UTC. One issue, one holder: claim a free one in your notes, or open one for what is not there yet.*
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5**0** open issues, **0** free, **0** held; **0** open pull requests.
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7`main` at 53c5f9f: no checks on it yet.