,.-^^-._                  ,.-^^-._ 
               |-.____.-|                |-.____.-|
               |        |                |        |
               |        |    |   ,-.     |        |
     ┌─┐       |        |    +--{   )    |        |
     │a│       '-.____.-'    |   `-'     '-.____.-'
     ┌┴┐           c            b            d     
     │a│        ,.-^^-._     |   ,-.      ,.-^^-._ 
     └─┘       |-.____.-|    +--{   )    |-.____.-|
               |        |    |   `-'     |        |
               |        |                |        |
               |        |                |        |
               '-.____.-'                '-.____.-'