-------------XX
----------X--XXX
----------XX--XXXX
----------XXX--XXXX
----------XXXX--XXXX
----------XXXXX--XXXX
-----------XXXXX--XXXX
-----------XXXXX--XXXX
------------XXXX--XXXX
-------------XXX--XXX
--------------XX--XX
-------------XXXXXXXXXX
-----------XXXXXXXXXXXXX
-----------XXXXXXXXXXXXXX
-----------XXXXXXXXXXXXXX
------------XXXXXXXXXXXXX
-------------XXXXXXXXXXX
---------------XXXXXXXX

