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SELECT * FROM ts_debug('l''invisible');
 ts_name | tok_type  |   description   |   token   |   dict_name    | tsvector 
---------+-----------+-----------------+-----------+----------------+----------
 english | asciiword | Word, all ASCII | l         | {english_stem} | 'l'
 english | blank     | Space symbols   | '         | {}             | 
 english | asciiword | Word, all ASCII | invisible | {english_stem} | 'invis'
(3 rows)