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0 Old HSK word(s):
Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.
Hsk Characters:
HSK -Characters and beyond:
Gb
Big5
Eng
Rad
Mega
Triple
Multilingual
from: Universala Vortaro, Zamenhof
Widerspruchsfreiheit (Math)
[xi1 er3 bo2 te4 di4 er4 wen4 ti2]
希尔伯特第二问题