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All answers having "Roots" as clue:

3 Character Answers:

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FTS



4 Character Answers:

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EPIC

SAGA



5 Character Answers:

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MNSRS

TORSO



6 Character Answers:

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ORIGIN



7 Character Answers:

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LINEAGE

ORIGINS

SOURCES



8 Character Answers:

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HOMELAND



10 Character Answers:

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TAKESSIDES



11 Character Answers:

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BLOCKBUSTER