safe, safer, safer than, clean, cleaner, cleaner, boring, more boring, more boring than, big, bigger, bigger than, dirty, dirtier, dirtier than, good, better, better than, dangerous, more dangerous, more dangerous than, fast, faster, faster than, bad, worse, worse than, easy, easier, easier than, difficult, more difficult, more difficult than, lucky, luckier, luckier than

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