code: public TableWriteItems withHashAndRangeKeysToDelete(
              String hashKeyName, String rangeKeyName, 
              Object... alternatingHashAndRangeKeyValues) {
          if (hashKeyName == null)
              throw new IllegalArgumentException("hash key name must be specified");
          if (rangeKeyName == null)
              throw new IllegalArgumentException("range key name must be specified");
          if (alternatingHashAndRangeKeyValues.length % 2 != 0)
              throw new IllegalArgumentException("number of hash and range key values must be the same");
          final int len = alternatingHashAndRangeKeyValues.length / 2;
          PrimaryKey[] primaryKeys = new PrimaryKey[len];
          for (int i=0; i < alternatingHashAndRangeKeyValues.length; i += 2) {
              primaryKeys[i >> 1] = new PrimaryKey(
                  hashKeyName, alternatingHashAndRangeKeyValues[i],
                  rangeKeyName, alternatingHashAndRangeKeyValues[i+1]);
          }
          return withPrimaryKeysToDelete(primaryKeys);
      }
docs: Used to specify multiple hash-and-range primary keys to be deleted
  from the current table.
  
  @param hashKeyName
  hash key name
  @param rangeKeyName
  range key name
  @param alternatingHashAndRangeKeyValues
  a list of alternating hash key value and range key value