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All answers having "End of observation" as clue:

8 Character Answers:

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WELLDONE



11 Character Answers:

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OLDGROWSAGE



13 Character Answers:

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NOTHINGTOLOSE



14 Character Answers:

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BYTHOSEWHODONT

ISEVERREVEALED

NONEOFTHEABOVE



15 Character Answers:

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MANISSTILLANAPE

THEFASTERITGOES