4. In the “LST-LFT” sheet, the current last column with an activity (Column H) is copied to the next column (column I) and then row 11 is copied down to the next row. Once again the order of copying must be maintained to avoid circular references. Again no extra editing is needed to update the names of the activities since the cells used for the designating the names of the activities in the “LST-LFT” sheet are connected to the corresponding cells in the “Inputs” sheet. The resulting “LST-LFT” sheet with the updated LST-LFT pairs for all the activities is shown in Figure A5.