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string GetNextCode(string preCode)
{
int num = (preCode[0]-'0') * 36 + preCode[1] - '0' + 1;
return ""+ (char)(num / 36 +'0') + (char)(num % 36 + '0');
}
string GetNextCode(string preCode)
{
int num = (preCode[0]-'0') * 26 + preCode[1] - '0' + 1;
return ""+ (char)(num / 26 +'0') + (char)(num % 26 + '0');
}