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All answers having "Examination" as clue:

4 Character Answers:

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ORAL

QUIZ

TEST



5 Character Answers:

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ASSAY

SWEAT

TRIAL



7 Character Answers:

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CHECKUP

PERUSAL



8 Character Answers:

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SCRUTINY



9 Character Answers:

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CLOSELOOK



13 Character Answers:

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CLOSESCRUTINY