gistfile1.txt

var contentAzDefinitions = this.cacheManager.Get(
  string.Concat("Patient.Contenttypes.Az.Ids.For.", letter),
  ctx => {
      ctx.Monitor(this.clock.When(Timespan.FromDays(1)));
      var titleDefinitions = this.letterRepository.Fetch(x => x.Title.StartsWith(letter)).toList();
      var content = this.contentManager.GetMany(titleDefinitions.Select(x => x.ContentItemId), VersionOptions.Published);
      
      var items = new List<AzLinkDefinition>();
      foreach(var titleDefinition in titleDefinitions)
      {
        var contentItem = content.FirstOrDefault(x => x.Id == titleDefinition.ContentItemId);
        items.Add(new AzLinkDefinition { Title = titleDefinition.Title, Path = contentItem.As<IAliasAspect>().Path, ContentType = contentItem.ContentType.Name });
      }
      
      return items;
  });
  
  var itemsByLetter = contentAzDefinitions.Where(x => x.ContentType == contentType);
  
  // do something here
}

class AzLinkDefinition
{
  public string Title { get; set; }
  public string Path { get; set; }
  public string ContentType { get; set; }
}