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This is the seventh installment of the Fortnightly Topic Challenges Rerun described here and the forty-eigth installment of the FTCs overall, with topics suggested and voted on here. This fortnight's topic is "Unusual tag mix" (suggested by melfnt) and will span from the 24th of January to the 6th of February. During this period, we will compile the list of relevant questions and post it as an answer to this question.

In the meantime, please go and propose and vote on future challenges!

Everyone have fun, and happy puzzling!

Link to other Fortnightly Topic Challenges.

NOTE
The suggestion is copied to this post for posterity.

Unusual tag mix

I like puzzles that mix very different topics and solution methods, even completely unrelated to each other. So my proposal for this challenge is simple: pick any two (or more) tags that are unlikely to be seen together and create a puzzle.

Some of my favorite mixes:

To help you with choosing the tags, I set up this query on SEDE that selects the unused pairs of tags considering only the top 30 tags on PSE (i.e. for each line of the query results there is no question tagged with both and ). Here is a snapshot of the results as of 2020-12-08, re-run the query at any time to check if something changed:

tag1 tag2
calculation-puzzle cryptic-clues
calculation-puzzle geography
calculation-puzzle rebus
calculation-puzzle steganography
chess computer-puzzle
chess english
chess language
chess pattern
chess word-property
combinatorics cipher
combinatorics cryptic-clues
combinatorics english
combinatorics geography
combinatorics language
combinatorics rebus
combinatorics rhyme
combinatorics steganography
combinatorics word-property
cryptic-clues word-property
geometry cryptic-clues
geometry english
geometry language
geometry rebus
geometry wordplay
optimization cipher
optimization cryptic-clues
optimization geography
optimization language
optimization rebus
optimization rhyme
optimization steganography
optimization wordplay
optimization word-property
rebus word-property
rhyme word-property
riddle optimization
strategy cryptic-clues
strategy english
strategy language
strategy rebus
strategy rhyme
strategy riddle
strategy steganography
strategy word
strategy wordplay
strategy word-property
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  • $\begingroup$ I am not able to re-run the query to get the updated results: I always get the same results even if I use some trick to disable the SEDE cache. Any help? $\endgroup$
    – melfnt
    Jan 28 at 16:03
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    $\begingroup$ Does a question still apply for this FTC if a tag combo is previously unused even if the way it combines the tags isn't particularly creative? (ie. a puzzle type, like word-sequence, and a knowledge type, like music, where a list of songs would reveal a property) $\endgroup$
    – samm82
    Jan 29 at 22:39
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    $\begingroup$ @samm82 yes, the only constraints for this challenge are the used tags $\endgroup$
    – melfnt
    Jan 31 at 15:10
  • $\begingroup$ I just realized there was a challenge with the same topic in 2016: puzzling.meta.stackexchange.com/questions/5614/… $\endgroup$
    – melfnt
    Feb 25 at 11:03
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List of all questions published as part of the Fortnightly Topic Challenge #48:


The highest-voted three of these are:

The most viewed three of these are:

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Some of the mentioned pairs of tags were used during the challenge. Here are the remaining ones as of 2021-02-01 (for each line of the table, there is still no question tagged with both tag1 and tag2):

tag1 tag2
calculation-puzzle geography
calculation-puzzle rebus
calculation-puzzle steganography
chess computer-puzzle
chess english
chess language
chess pattern
chess word-property
combinatorics cipher
combinatorics cryptic-clues
combinatorics geography
combinatorics language
combinatorics rebus
combinatorics rhyme
combinatorics steganography
combinatorics word-property
geometry english
geometry language
geometry rebus
geometry wordplay
optimization cipher
optimization cryptic-clues
optimization geography
optimization language
optimization rebus
optimization rhyme
optimization steganography
optimization wordplay
optimization word-property
rhyme word-property
riddle optimization
strategy cryptic-clues
strategy english
strategy language
strategy rebus
strategy rhyme
strategy riddle
strategy steganography
strategy word
strategy wordplay
strategy word-property

And here are the ruled out pairs:

tag1 tag2 ruled out by
cryptic-clues word-property A Cryptic Property
geometry cryptic-clues Cryptic Geometry
combinatorics english Mathematics for the English major
rebus word-property What is a Prebus Word™?
calculation-puzzle cryptic-clues A Cryptic Cryptarithm
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