家住蒲汇塘边，闲来打渔为生.大陆帖子常被和谐，所有博客都曾被关闭。此地来偷闲。 My blog were censored or blocked in mainland China. To backup my files, post here.
most of the orthogons direct from the square or its orthogonal,that might be why call the "orthogons". In the picture, you can see 6 orthogons.
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