What each of this puzzle's longest entries has two of

Question:

Answer:

SIS

Length:

Similar Crossword Questions:

2006 Disney film, and the ends of the eight longest entries in this puzzle
New Haven collegian hidden in this puzzle's longest entries
What this puzzle's three longest entries are all about?
"Lady of letters" featured in this puzzle's four longest entries
A synonym for it can be found inside this puzzle's four longest entries
Soft stuff found in this puzzle's four longest Across entries
Link buried in this puzzle's three longest entries
Job, figuratively, and what's inside each of this puzzle's four longest entries
What the four longest entries in this puzzle (except this one) are examples of
Sophomoric grade found in this puzzle's three longest entries
Sales person's forte, and a synonym for the ends of this puzzle's three longest entries
Promising words (and what's hidden in this puzzle's four longest entries)
Word that can come before the last word of this puzzle's longest entries
Charged particle taken from this puzzle's four longest entries
Little ones who, they say, are made up of the ends of this puzzle's four longest entries
"Awesome!" addition to this puzzle's three longest entries
Insincere talk, and a hint to the starts of this puzzle's four other longest entries
Spars in the ring, and features of the four longest puzzle answers
Word that can precede the first word of the twelve starred entries in this puzzle
Apt subject for today that's hidden in this puzzle's four longest answers
Word that has two diametrically opposed meanings (like this puzzle's eight theme entries)
Bird hiding in the four longest puzzle answers
Scholastic mean, briefly, hidden in this puzzle's seven longest answers
Ocean predator, of which there are five types starting this puzzle's longest answers
Coastal irregularities, and word anagrammed in this puzzle's four longest answers