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All answers having "School" as clue:

3 Character Answers:

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BUS

ISM

MED

OLD

POD



4 Character Answers:

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AGER

GRAD

MARM

PREP

SECT



5 Character Answers:

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ECOLE

GRADE

LYCEE

MARMS

TEACH

TRADE

TRAIN



6 Character Answers:

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NORMAL

SUNDAY



7 Character Answers:

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ACADEMY

COLLEGE

EDUCATE

ESCUELA



8 Character Answers:

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BONIFACE

IDEOLOGY

INSTRUCT

SEMINARY



10 Character Answers:

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ELEMENTARY



12 Character Answers:

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KINDERGARTEN