How can I remove duplicated tags (not synonyms)
8915
How can we get rid of misspelled and unused (or "zombie") tags?
29532
How to convert multiple  tag to a single  tag in php
61980
Is there a way to perform a search in such a way as to exclude a specific tag?
70217
Duplicate meta descriptions & title tags
72253
Excluding tags from search results
73327
Remove duplicate items from an array
5212
How to remove duplicate lines inside a text file?
147570
Mark questions as duplicate of tag wiki
2817
How to remove duplicate characters?
20336
Change "original tags" to "current tags" in the help center description of the dupehammer
101748
Duplicate / Similar content across many articles
28375
Allow wildcards in ignored/interesting tags
34883
Remove specific duplicates (all but latest)
98403
remove only some html tags on c#
122773
Use custom tags to split bibliography
45843
Remove "Category:", "Tag:", "Author:" from the_archive_title
95586
Have "Interesting Tags" that are combinations of tags