))___mmmm__mm____
   mmmmmmmmmmmmmmmmm
 (mmmmmmmmmmmmmmmmmm)
(mmmmmmMMMmmmMMMmmmmm)
 mmm // // // // //mm
m =     |   |      =mm
m mm=   |   |      =mm
mm| U            U  mm
mm|  uU         uU  |mm
  |    uU      uU   |
  |     uuUuuuu     |
  \-----------------/
        |___|__|
       /         \
     /            \           
    |              \
    |               |
    |_______________|