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Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
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answers:0 (none)
isaccepted:yes
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Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
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is:answer
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Search options not deleted user 22016

is for questions about whether a word or phrase is considered formal or informal. Be sure to include as much context as you can, because sometimes how formal or informal a word or phrase is can be different in different situations.

0 votes

It has been known since long time that / Since long, it has been known that

My suggestion on how to improve the wording: 1) It has long been known that ... 2) Since time immemorial, it has been known that ...
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