The eight longest answers in this puzzle each have 13 unique ones

Question:

Answer:

LETTERS

Length:

Similar Crossword Questions:

Theme of this puzzle hidden in the seven other longest across answers
It precedes the last words of the four longest puzzle answers
Word "split" in this puzzle's eight longest answers
Some graffiti signatures (which were used to form this puzzle's four longest answers)
Narcissists' interests (one of which can be found in each of the puzzle's longest answers)
Word separated in this puzzle's six longest answers
"Dough" found in this puzzle's four longest answers
Last letter in most plurals (but not in this puzzle's six longest answers, which are the only plurals in this grid)
They're found at the end of this puzzle's longest answers
Featured article hidden in this puzzle's nine longest answers
Guess, in brief (and what's been added to this puzzle's longest answers)
Deg. of the professional who may instruct you to do the last words of the four longest puzzle answers
A kind of one ends each of this puzzle's four longest answers
What this puzzle's four longest answers have in common
Busy one that has made its mark in this puzzle's five longest answers
Popular version of a design principle acronym spelled out by the starts of this puzzle's four longest answers
Obstinate, and what the other four longest puzzle answers are?
The starts of this puzzle's three longest answers are shades of it
Ocean "crossing" this puzzle's four longest answers (abbr.)
A good one follows the starts of the four longest puzzle answers
Exhibit found in this puzzle's four longest answers
AprÃ¨s-___ (following a day on the slopes -- and, literally, where the first words of the four longest puzzle answers can be found)
Ocean predator, of which there are five types starting this puzzle's longest answers
Spars in the ring, and features of the four longest puzzle answers
What this puzzle's seven longest answers have in common