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Rule "Word contains a ligature"

This is one of many errors that LanguageTool can detect.

Description:	Word contains a ligature
Message:	The word '\1' contains a ligature (joined letters). Modern English does not usually use ligatures. A ligature in a word causes a spelling error. If the word is an English word, write it with standard characters.
Category:	Possible Typo (ID: TYPOS)
Link:	https://en.wikipedia.org/wiki/Typographic_ligature
Incorrect sentences that this rule can detect:	LanguageTool finds spelling errors. [The word 'finds' contains a ligature, not the characters f i.] An æon is a technical term. [ae] This effects many rules. [ef] Her influence is strong. [fl]
Correct sentences for comparison:	LanguageTool finds spelling errors. LanguageTool 【Upgraded version... The correct spelling of the proper noun 'Encyclopædia Britannica' uses a ligature (https://corporate.britannica.com/contact/). The Danish and Norwegian alphabets end with æ—ø—å, whereas the Icelandic... ... from its Old English meaning, dægesege, from dæges eage meaning "day's eye," and this was... ... accensum ardeat donec totum consumatur, nihilque fæcum aut phlegmatis in fundo remaneat.
ID:	LIGATURES [1]
Version:	6.8-SNAPSHOT (2025-10-29 22:33:07 +0100)