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All answers having "Paper size" as clue:

4 Character Answers:

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DEMY

POTT



5 Character Answers:

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ATLAS

LEGAL



6 Character Answers:

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LETTER

OCTAVO

QUARTO



7 Character Answers:

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TABLOID



8 Character Answers:

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FOLLSCAP

FOOLSCAP

IMPERIAL



10 Character Answers:

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COMPREHEND