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All answers having "1" as clue:

3 Character Answers:

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ABE

AGE

ALI

BIL

BTU

CEN

COE

DAY

DEE

DII

EON

FGS

GEE

HRE

JAN

KIP

MCC

MCD

MCI

MCL

MCM

MCV

MDI

MEG

MII

MIL

MIV

MLI

MLV

MLX

MVI

NOS

NRS

ODD

ONE

RTE

TAN

TOP

YDS

YEN



4 Character Answers:

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AEON

ALPS

AMOS

ATWT

BEST

BUCK

CUBE

GOAT

KILO

KNOT

MCCI

MCLI

MCXI

MCXL

MDCI

MDLI

MIII

MILE

MILS

MINN

MMMX

MXIV

ONEK

SLOW

STEP

TOME

URAL

USES

WERE



5 Character Answers:

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ALPHA

CDIII

DIGIT

DINAR

GRAMS

GRAND

MAIDS

MARKS

MCLVI

MDCII

MDVII

MILER

MILLE

MILOS

MMMIX

MODES

MOLES

PAPER

STERE

TAHOE

THERM

THREE

TONNE

URALS



6 Character Answers:

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ARABIC

FIGURE

MESSES

MUFFIN

ONEMEG

ONEOFF

SENECA

TALMUD

TOPROW



7 Character Answers:

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GREATER

INTEGER

LOWGEAR

MURRELL

NUMERAL

SEAMILE

TESTING

THEBEST



8 Character Answers:

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COLORADO

DICKBASS

IDITAROD

INTEGERS

MCIBILLS

MICROBES

MIGRATES

NEGATIVE

NUMERALS

SEAMILES

TENTIMES



9 Character Answers:

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HUDSONBAY

IMAGINARY

KILOCYCLE

KILOHERTZ

MDDEGREES

METRICTON

MILLENNIA

MILLINERS

MINTJULEP

NONILLION

SACAGAWEA

SUBWERAIN

THETALMUD



10 Character Answers:

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DOLLARBILL

EISENHOWER

ENTERPRISE

GALESAYERS

MXMISSILES

SEXTILLION



11 Character Answers:

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TWOMINUSONE



12 Character Answers:

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MIXMETAPHORS

PERFECTCUBES



13 Character Answers:

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IDITARODTRAIL

ONEINAMILLION

TOPOFTHEORDER



14 Character Answers:

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ONEHUNDREDXTEN

TICTACTOEBOARD



15 Character Answers:

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EIGHTMINUSSEVEN

ELEVENGALLONHAT

EXCLAMATIONMARK



19 Character Answers:

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FIRSTPERSONSINGULAR