ServiceNow Dublicate rmeover

// ServiceNow dublicate remover

var arrayUtil = new global.ArrayUtil();

var gr = new GlideRecord("sys_user_group");
gr.addEncodedQuery("");
gr.setWorkflow(false); //Do not run business rules
gr.autoSysFields(false); //Do not update system fields
gr.query();
while (gr.next()) {
  var chars = [];
  chars = gr.type.split(",");
  if (chars.length >= 2) {
    chars = arrayUtil.unique(chars);
  }
  gr.setValue("type", chars.toString());
  gr.update();
}