What is the function <> group use for?

[veseek]

< > Grouping
translated
< > 分组

but what the <> working for?

I tested the search word

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1 11

or the

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<1> <11>

, but result is the same.

[NotNull]

Command grouping is used to influence the order in which your search terms are "executed".
Much like the () in arithmetic: compare 1 + 1 * 10 (=11) with (1 + 1) * 10 (=20).

Most common usage in Everything is to influence the defaults for AND (a space) and OR ( | ).
Example:

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ext:ini  c:\folder1 | c:\folder2  ext:txt

Would show you the files in C:\folder1 and C:\folder2, but only the ones that have extension INI ànd have extension TXT
(that will be 0 files as a file can have only one file extension)

Whereas:

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< ext:ini c:\folder1 > | < c:\folder2 ext:txt > 

Will show you all INI files in C:\folder1 and all TXT files in C:\folder2