code: public void setAdditionalLanguageCodes(java.util.Collection<String> additionalLanguageCodes) {
          if (additionalLanguageCodes == null) {
              this.additionalLanguageCodes = null;
              return;
          }
  
          this.additionalLanguageCodes = new java.util.ArrayList<String>(additionalLanguageCodes);
      }
docs: <p>
  Additional codes for languages available for the specified voice in addition to its default language.
  </p>
  <p>
  For example, the default language for Aditi is Indian English (en-IN) because it was first used for that
  language. Since Aditi is bilingual and fluent in both Indian English and Hindi, this parameter would show the
  code <code>hi-IN</code>.
  </p>
  
  @param additionalLanguageCodes
  Additional codes for languages available for the specified voice in addition to its default language. </p>
  <p>
  For example, the default language for Aditi is Indian English (en-IN) because it was first used for that
  language. Since Aditi is bilingual and fluent in both Indian English and Hindi, this parameter would show
  the code <code>hi-IN</code>.
  @see LanguageCode