public static List<String> toHexStrings(byte[] bytes, int bytesPerLine = 16) {
        def sw = new StringWriter()
        bytes.encodeHex().writeTo(sw)
        return Splitter.fixedLength(bytesPerLine * 2).split(sw.toString()).collect { line ->
            Splitter.fixedLength(2).split(line).join(" ")
        }
    }

    public static int levenshteinDistance(byte[] lhs, byte[] rhs) {
        int len0 = lhs.length + 1;