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All answers having "Encounters" as clue:

3 Character Answers:

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RUN



4 Character Answers:

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BURP

SEES



5 Character Answers:

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MEETS



6 Character Answers:

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FIGHTS

RUNINS



7 Character Answers:

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ISTHMUS



8 Character Answers:

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MEETINGS

RUNSINTO



10 Character Answers:

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MODERNISED