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- public Optional<String> tryFindSimilar(String s) //...
- Optional<Optional<String>> bad = opt.map(this::tryFindSimilar);
- Optional<String> similar = opt.flatMap(this::tryFindSimilar);
- Optional<Integer> maxPrime(Optional<Integer> from, Optional<Integer> to)
- Optional<Integer> maxPrime(Optional<Integer> from, Integer to)
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