num ='s
#================#    16

                          line | num spaces | num .'s | num spaces 
|      <><>      |         1   |     6      |    0    |     6
|    <>....<>    |         2   |     4      |    4    |     4
|  <>........<>  |         3   |     2      |    8    |     2
|<>............<>|         4   |     0      |    12   |     0
                    expression:  -2*line+8  |4*line-4 | -2*line+8

                          line | num spaces | num .'s | num spaces 
|<>............<>|         4   |     0      |    12   |     0
|  <>........<>  |         3   |     2      |    8    |     2
|    <>....<>    |         2   |     4      |    4    |     4
|      <><>      |         1   |     6      |    0    |     6
                    expression:  -2*line+8  |4*line-4 | -2*line+8

#================# (same as first line)