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May 5th, 2015
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  1. public Optional<String> tryFindSimilar(String s) //...
  2.  
  3. Optional<Optional<String>> bad = opt.map(this::tryFindSimilar);
  4. Optional<String> similar = opt.flatMap(this::tryFindSimilar);
  5.  
  6. Optional<Integer> maxPrime(Optional<Integer> from, Optional<Integer> to)
  7.  
  8. Optional<Integer> maxPrime(Optional<Integer> from, Integer to)
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