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All answers having "Calendar abbr." as clue:

3 Character Answers:

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APL

APR

AUG

DEC

FEB

FRI

JAN

JUL

MAR

MON

NOV

OCT

RHO

SAT

SEP

SUN

THU

TUE

WED



4 Character Answers:

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SEPT

THUR

TUES



5 Character Answers:

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THURS