.inOrder();
  }

  private static final class TestDatum {
    final String letter;
    final int number;

    TestDatum(String letter, int number) {
      this.letter = letter;
      this.number = number;
    }

    @Override
    public String toString() {
      return letter + number;
    }

    @Override
    public boolean equals(@Nullable Object o) {

)

const letterBytes = "abcdefghijklmnopqrstuvwxyz01234569"
const (
	letterIdxBits = 6                    // 6 bits to represent a letter index
	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

// Random number state.
// We generate random temporary file names so that there's a good