> On Oct 13, 2025, at 11:39, David G. Johnston <[email protected]> 
> wrote:
> 
> 
> “iif” is shorthand for “if and only if”.  So it isn’t likely to be a typo; it 
> only needs to be changed if it is wrong.  I haven’t looked to see.
> 

Thanks for the explanation, I wasn’t aware of that. I learned.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/




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