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All answers having "Set out" as clue:

4 Character Answers:

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LEFT



5 Character Answers:

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ARRAY

BEGAN

BEGIN

BEGUN

LEAVE

START



6 Character Answers:

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DEPART

EMBARK



7 Character Answers:

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ARRAYED

SALLIED

STARTED



9 Character Answers:

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COMMENCED



10 Character Answers:

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HITTHEROAD

SALLYFORTH