:returns: A list of block matches which appear to be identical

def identical_blocks(self):
        """
        :returns: A list of block matches which appear to be identical
        """
        identical_blocks = []
        for (block_a, block_b) in self._block_matches:
            if self.blocks_probably_identical(block_a, block_b):
                identical_blocks.append((block_a, block_b))
        return identical_blocks