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    /**
    * Combine two byte arrays
    *
    * @param l
    *      first byte array
    * @param r
    *      second byte array
    * @return byte[] combined byte array
    */
    public static byte[] concatenate(byte[] l, byte[] r) {
        byte[] b = new byte[l.length + r.length];
        System.arraycopy(l, 0, b, 0, l.length);
        System.arraycopy(r, 0, b, l.length, r.length);
        return b;
    }