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How can I make a new Tag on Puzzling Beta ?
I was doing some Knights and Knave Puzzles by Smullyan and was slightly disappointed that there was no tag to differentiate these puzzles from the others ...
There actually is a tag for this: the liars tag, now synonymised with the knights-and-knaves tag. This is the tag to use for your questions.
As informed by @CoolGuy in the comments , One can only make tags only if you have a reputation of at least 150