/// <summary>
/// Find the most specific ItemVersion which contains all the ItemVersions in the list
/// </summary>
/// <param name="versions">list of ItemVersions</param>
/// <returns>Most specific ItemVersion containing all in list</returns>
public static ItemVersion LeastAbstractCommonVersion(IEnumerable <ItemVersion> versions)
{
ItemVersion result = null;
versions.Do(v => result = (result == null ? v : result.LeastAbstractCommonVersion(v)));
return(result);
}