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All answers having "Farm structure" as clue:

3 Character Answers:

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PEN

RHO

STY



4 Character Answers:

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BARN

COOP

COTE

CRIB

SHED

SILO



6 Character Answers:

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PIGPEN



7 Character Answers:

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HENNERY



8 Character Answers:

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ICEHOUSE

TOOLSHED



9 Character Answers:

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GRAINSILO