code: async def provStacks(self, offs, size):
          '''
          Return stream of (iden, provenance stack) tuples at the given offset.
          '''
          count = 0
          for iden, stack in self.cell.provstor.provStacks(offs, size):
              count += 1
              if not count % 1000:
                  await asyncio.sleep(0)
              yield s_common.ehex(iden), stacync def provStacks(self, offs, size):
          '''
          Return stream of (iden, provenance stack) tuples at the given offset.
          '''
          count = 0
          for iden, stack in self.cell.provstor.provStacks(offs, size):
              count += 1
              if not count % 1000:
                  await asyncio.sleep(0)
              yield s_common.ehex(iden), stack
docs: Return stream of (iden, provenance stack) tuples at the given offset.