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All answers having "Class ___" as clue:

3 Character Answers:

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ACT

ILK

RHO



4 Character Answers:

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KIND

RATE

SORT

TIER

TYPE

YEAR



5 Character Answers:

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CASTE

CLOWN

GENRE

GENUS

GRADE

ORDER

STYLE



6 Character Answers:

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LESSON

RATING



7 Character Answers:

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ECHELON

SPECIES



8 Character Answers:

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CATEGORY

ELEGANCE

TUTORIAL