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Rule "bu (by, bus, but)"

This is one of many errors that LanguageTool can detect.

Description: bu (by, bus, but)
Message: Make sure that '\1' is an abbreviation (bureau, bushel). Did you mean <suggestion>by</suggestion>, <suggestion>but</suggestion>, <suggestion>bug</suggestion>, or <suggestion>bus</suggestion>?
Category: Possible Typo (ID: TYPOS)
Link: https://www.merriam-webster.com/dictionary/bu
Incorrect sentences
that this rule can detect:
  • I did it bu mistake.
    Correction suggestion: by, but, bug, bus
  • The food is cheap bu t delicious.
    Correction suggestion: by, but, bug, bus
  • There is a subtle bu in the software.
    Correction suggestion: by, but, bug, bus
  • I was on the bu when I saw the accident.
    Correction suggestion: by, but, bug, bus
  • Bu is this correct?
    Correction suggestion: By, But, Bug, Bus
Correct sentences
for comparison:
  • I did it by mistake.
  • Which BU did you mean?
  • Refer to https://www.bu.edu for more information.
ID: BU [1]
Version: 6.8-SNAPSHOT (2025-10-23 22:33:08 +0200)