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All answers having "Milk source" as clue:

3 Character Answers:

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COW

EWE

RHO

SOY



4 Character Answers:

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GOAT

OATS

SOYA

TEAT



5 Character Answers:

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DAIRY

UDDER



6 Character Answers:

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UDDERS



7 Character Answers:

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COCONUT



8 Character Answers:

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HOLSTEIN



9 Character Answers:

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DAIRYFARM

JERSEYCOW