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All answers having "Washington" as clue:

3 Character Answers:

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ETA

GEN

GEO

HTS

LEE

MTS

NDU

NNE

PIE



4 Character Answers:

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CITY

ETAT

GENS

PIES

PORT



5 Character Answers:

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ACTOR

STATE

SWAMP



6 Character Answers:

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DACTYL

HOWARD

IRVING

MASONS

SQUARE

STATES



7 Character Answers:

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CAPITAL

PATRIOT

SENATOR

SURNAME

USSTATE



8 Character Answers:

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USCITIES



10 Character Answers:

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THECAPITOL



11 Character Answers:

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CAPITALCITY



12 Character Answers:

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PACIFICSTATE



13 Character Answers:

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GENERALGEORGE



15 Character Answers:

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LAKENEARSEATTLE

LANDOFTHEFREEZE

SONGSTRESSDINAH