Umberto Eco would have added ;-):
13. Don't be repetitious; don't repeat the same thing twice; repeating is superfluous (redundancy means the useless explanation of something the reader has already understood).
http://gioclairval.blogspot.com/2010/02/umberto-ecos-rules-f...
"Omit needless words! Omit needless words! Omit needless words!"
https://www.brusselslegal.com/article/display/2563/Tip_2_Omi...
https://www.bartleby.com/141/strunk5.html#13