return map().lowerKey(e);
    }

    @Override
    public @Nullable K floor(@ParametricNullness K e) {
      return map().floorKey(e);
    }

    @Override
    public @Nullable K ceiling(@ParametricNullness K e) {
      return map().ceilingKey(e);
    }

    @Override
    public @Nullable K higher(@ParametricNullness K e) {
      return map().higherKey(e);
    }

      return map().lowerKey(e);
    }

    @Override
    public @Nullable K floor(@ParametricNullness K e) {
      return map().floorKey(e);
    }

    @Override
    public @Nullable K ceiling(@ParametricNullness K e) {
      return map().ceilingKey(e);
    }

    @Override
    public @Nullable K higher(@ParametricNullness K e) {
      return map().higherKey(e);
    }

really I'm quite tired of being such a tiny little thing!'

  It did so indeed, and much sooner than she had expected:
before she had drunk half the bottle, she found her head pressing
against the ceiling, and had to stoop to save her neck from being
broken.  She hastily put down the bottle, saying to herself
`That's quite enough--I hope I shan't grow any more--As it is, I

really I'm quite tired of being such a tiny little thing!'

  It did so indeed, and much sooner than she had expected:
before she had drunk half the bottle, she found her head pressing
against the ceiling, and had to stoop to save her neck from being
broken.  She hastily put down the bottle, saying to herself
`That's quite enough--I hope I shan't grow any more--As it is, I