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All answers having "Mexican Indian." as clue:

4 Character Answers:

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MAYA

MIXE

PIMA

SERI

TECA



5 Character Answers:

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AZTEC

HUAVE

NAHUA

OPATA

OTOMI

YAQUI

YUMAN



6 Character Answers:

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TOLTEC



7 Character Answers:

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ZAPOTEC