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All answers having "Sketch" as clue:

3 Character Answers:

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DIP

PAD

RHO



4 Character Answers:

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DRAW

LIMN

PLAN

ROAM

SKIT



5 Character Answers:

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DRAFT

ETCHA

TRACE



6 Character Answers:

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LAYOUT

MAPOUT

PENCIL



7 Character Answers:

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DIAGRAM

DRAWING

OUTLINE

RELEASE



8 Character Answers:

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DESCRIBE

VIGNETTE



9 Character Answers:

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DELINEATE



10 Character Answers:

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ROUGHDRAFT



11 Character Answers:

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DELINEATION