Are there specific steps to create and validate duplicate vanity urls -Scenario : if the content author enters a  duplicate vanity url provide an alert message .

Im working on a project that has multiple markets and AEM is our CMS. Wanted to know if we can use same vanity urls for same page across different markets.I know vanity url in AEM does not allow duplicates within a single instance. But has anyone seen a work around that would facilitate the same.To ...