code: @Deprecated
      public static String concatenate(char[] left, char[] right,Mode mode, int options) {
          StringBuilder dest=new StringBuilder(left.length+right.length+16).append(left);
          return mode.getNormalizer2(options).append(dest, CharBuffer.wrap(right)).toString();
      }
docs: Concatenate normalized strings, making sure that the result is normalized
  as well.
  
  If both the left and the right strings are in
  the normalization form according to "mode",
  then the result will be
  
  <code>
  dest=normalize(left+right, mode)
  </code>
  
  For details see concatenate
  
  @param left Left source string.
  @param right Right source string.
  @param mode The normalization mode.
  @param options The normalization options, ORed together (0 for no options).
  @return result
  
  @see #concatenate
  @see #normalize
  @see #next
  @see #previous
  @see #concatenate
  @deprecated ICU 56 Use {@link Normalizer2} instead.
  @hide original deprecated declaration