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All answers having "Section" as clue:

3 Character Answers:

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DIV

LEG



4 Character Answers:

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AREA

PANE

PART

UNIT



5 Character Answers:

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CONIC

OFFER

PANEL

PIECE



7 Character Answers:

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CHAPTER

NOTICES

SEGMENT



8 Character Answers:

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CESARIAN



9 Character Answers:

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CAESAREAN



10 Character Answers:

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DEPARTMENT



11 Character Answers:

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SUBDIVISION