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All answers having "--- Bias" as clue:

3 Character Answers:

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GIL



4 Character Answers:

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SKEW

SPIN

TILT

WARP



5 Character Answers:

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SLANT



8 Character Answers:

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DIAGONAL

TENDENCY



9 Character Answers:

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PREJUDICE



10 Character Answers:

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PREPOSSESS



13 Character Answers:

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PRECONCEPTION