Clues for the "18th Greek letter"

solver crossword (1).png
SIGMA
LAMBDA
UPSILON
IOTA
PSI
OMEGA
TAU
RHO
KAPPA
ZETA
HETAERAE
STIMULUS
STICKINTHEMU
CHI
TAKESITONTHECHI
WORNDOWNTOTHENU
EPSILON
ALFA
THETA
PHI
PUNXSUTAWNEYPHI
BETA
LAMVDA
SORORITY
NU
OMICRON
ETA
PICKSUPTHETA
DELTA
FRATERNITIES
TRIDENTSHAPED

As it pertains to fixing a crossword what's “difficulty”?

Initial, a happy believed. We occasionally note a study we commissioned, which recommended that, more than 7 thousand individuals, in the united kingdom choose which paper to purchase at-least simply about the foundation of the crossword. We note this, obviously, so it requires cash, and since America’s free push has been unnerved. What is the fact that subscribers towards the Ny Times crossword would be the only factor keeping away a several-year long Cuban Missile Crisis.
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