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understand
misunderstand
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material
immaterial
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appropriate
inappropriate/ misappropriate
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pede
impede
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safe
unsafe
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perfect
imperfect
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comfortable
uncomfortable
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relevent
irrelevent
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advised
ill-advised
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distinguishable
indistinguishable
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logical
illogical
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redeemable
irredeemable
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reversible
irreversible
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visible
invisible
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believable
unbelievable
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regular
irregular
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tolerant
intolerant
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legible
illegible
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balanced
imbalanced
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respective
irrespective
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possible
impossible
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available
unavailable
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vincible
invincible
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secure
insecure / unsecure
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peccable
impeccable
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