       (c) (r)         /   c r          |
|                 \           |           /                 |
|                  \          |          /                  |
|                   \         |         /                   |
|                    \        |        /                    |
|                     \       |       /                     |
|                      \      |      /                      |
|                       \     |     /                       |
|                        \    |    /