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All answers having "My stars!" as clue:

3 Character Answers:

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GEE



4 Character Answers:

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EGAD

ISAY



5 Character Answers:

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EGADS

LORDY

OHGEE



6 Character Answers:

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DEARME

OHDEAR



8 Character Answers:

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IDECLARE

OHDEARME



15 Character Answers:

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FORGOODNESSSAKE