User:Roger Hui

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許國華

Interests: J, APL,

mathematics/programming puzzles

([https://www.jsoftware.com/jwiki/Essays/Queens_and_Knights example 0]; [https://forums.dyalog.com/viewtopic.php?f=30&t=1664 example 1])

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Places visited:

countries (ccTLD)

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Canadian provinces

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American states,
districts, etc.

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