code: def killCellRegion(self, centerColumn, radius):
      
      self.deadCols = topology.wrappingNeighborhood(centerColumn,
                                            radius,
                                            self._columnDimensions)
      self.deadColumnInputSpan = self.getConnectedSpan(self.deadCols)
      self.removeDeadColumns()
docs: Kill cells around a centerColumn, within radius