code: public Observable<ServiceResponse<Page<DeletedSasDefinitionItem>>> getDeletedSasDefinitionsWithServiceResponseAsync(final String vaultBaseUrl, final String storageAccountName) {
          return getDeletedSasDefinitionsSinglePageAsync(vaultBaseUrl, storageAccountName)
              .concatMap(new Func1<ServiceResponse<Page<DeletedSasDefinitionItem>>, Observable<ServiceResponse<Page<DeletedSasDefinitionItem>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<DeletedSasDefinitionItem>>> call(ServiceResponse<Page<DeletedSasDefinitionItem>> page) {
                      String nextPageLink = page.body().nextPageLink();
                      if (nextPageLink == null) {
                          return Observable.just(page);
                      }
                      return Observable.just(page).concatWith(getDeletedSasDefinitionsNextWithServiceResponseAsync(nextPageLink));
                  }
              });
      }
docs: Lists deleted SAS definitions for the specified vault and storage account.
  The Get Deleted Sas Definitions operation returns the SAS definitions that have been deleted for a vault enabled for soft-delete. This operation requires the storage/listsas permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param storageAccountName The name of the storage account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;DeletedSasDefinitionItem&gt; object