unhappy, 2. ___happy , disagree, 3. ___agree , rewrite, 4. ___write , underpaid, 5. ___paid , illegal, 7. ___legal , impossible, 8. ___possible , inactive, 9. ___active , disappear, 12. ___appear , rebuild, 13. ___build , unlock, 14. ___lock , unknown, 15. ___known , unusual, 16. ___usual , irregular, 18. ___regular , disconnect, 19. ___connect .

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