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All answers having "Summary" as clue:

4 Character Answers:

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OUTL



5 Character Answers:

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BRIEF

OVERT

RECAP

TERSE



6 Character Answers:

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APERCU

DIGEST

PRECIS

RESUME

RUNNER



7 Character Answers:

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EPITOME

ONEROUS

OUTLINE

ROUNDUP



8 Character Answers:

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ABSTRACT

ARGUMENT

CARESSED

MAGICIAN

SYNOPSIS