model


1    7     7 1 1                          7nn-7nn = 162 variations     77ann = 162 possible 81 effective (override) variations
           7 1 2                                    135 effective	 ann = 135 effective 81 realistic (override) variations
2    8     7 1 3 
           7 1 4
3    9     7 1 5
           7 1 6 ... = 324 variations     
4    10                270 effective (715=751)

5    11

6    13

     14

     15