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__regular
irregular
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__proper
improper
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__responsible
irresponsible
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___polite
impolite
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Okay!
__relevant
irrelevant
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Okay!
__think
rethink
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__possible
impossible
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__appropriate
inappropriate
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__active
inactive
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___manage
mismanage
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Okay!
__behave
misbehave
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Okay!
__calculate
miscalculate
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Okay!
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