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Published at 665 × 664 in How to write a crossnumber

The grid for crossnumber #6. Rotating this grid 180° leads to the same grid with inverted colours.

Matthew is a research software engineer (RSE) in the Advanced Research Computing Centre (ARC) at University College London (UCL). His hobbies include pretending to be called Humbug (H).
mscroggs.co.uk    All articles by Matthew

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