most of which are quite printable
https://blog.csdn.net/ranjio_z/article/details/51993040?utm_source=blogxgwz8
http://www.unicode.org/charts/PDF/U2000.pdf
| unicode | 显示符号 | | --- | --- | |\u2000| | |\u2001| | |\u2002| | |\u2003| | |\u2004| | |\u2005| | |\u2006| | |\u2007| | |\u2008| | |\u2009| | |\u200a| | |\u200b|| |\u200c|| |\u200d|| |\u200e …
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