code: def concat_same_type(self, to_concat, placement=None):
          
          values = self._concatenator([blk.values for blk in to_concat],
                                      axis=self.ndim - 1)
          return self.make_block_same_class(
              values, placement=placement or slice(0, len(values), 1))
docs: Concatenate list of single blocks of the same type.