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All answers having "Western Indian" as clue:

3 Character Answers:

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HOP

OTO

REE

SAC

SIA

UTE



4 Character Answers:

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CREE

CROW

HOPI

OTOE

PIMA

SAUK

UTAH

YUMA



5 Character Answers:

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OMAHA

OSAGE

PIUTE

TETON

UINTA



6 Character Answers:

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DAKOTA

MOHAVE

NAVAHO

PAIUTE



7 Character Answers:

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ARAPAHO