Before avoid some problems we should know the period of encoding from input into output.
Abstract Character Repertoire(Abstract Character for short)
It is a character set that system support, the set can be closed and open, it belong to computer's system and it will update the character set with the system's upgrade if
it is open. For example, the series of ASCII, ISO/IEC character set a ...
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Mon Oct 14 2019
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Beijing;