code: protected String getVersionString(int sessionVersion) {
          String sessionVersionString = _versionPrefix;
          if (_versionPrefixLength > 0) {
              if (sessionVersion > 0) {
                  StringBuffer sb = new StringBuffer();
                  sb.append(_versionPrefix).append(sessionVersion);
                  sessionVersionString = sb.substring(sb.length() - _versionPrefixLength, sb.length());
              }
          } else {
              sessionVersionString = "";
          }
          return sessionVersionString;
      }
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