he case of two CellularSpaces, this function is called twice for e ach pair of Cells, first filter(c1, c2) and then filter(c2, c1), where c1 belongs to cs1 and c2 belongs to cs2. The default value is a function that returns true.
    </li> 
    
  
    <li>
	  <strong>inmemory</strong>: If true (default), a Neighborhood will be built and stored for each Cell of the CellularSpace. The Neighborhoods will change only if the modeler add or remove neighbors explicitly. In this case, if any of the attributes the 