irregular, regular, irresponsible, responsible, irrational, rational, unfair, fair, untidy, tidy, unsurprising, surprising, unkind, kind, uncomfortable, comfortable, unfriendly, friendly, illegal, legal, illegible, legible, illogical, logical, illiterate, literate, invisible, visible, incorrect, correct, intolerate, tolerate, incredible, credible, insensitive, sensitive, impatient, patient, immature, mature, impossible, possible, disorganised, organised, disobedient, obedient, dishonest, honest, dissatisfied, satisfied

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