: 
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______$_______________$$_______$$_______$
______$_______________$$______$$$$$$$$$$$
______$_______________$$_____$$$$$$$_____$
______$$_______________$$____$$$$$$$_____$
______$$________________$$$$$$$$$$$$_____$
_____$$________________________$$$$_____$
_____$$___________________________$$___$$
____$$______________________________$$$__$
____$$___________________________________$$
____$$__________________________________$$$$$$$
$$$$$$$______$$$________________$$$______$
____$$_______$$$________________$$$_____$$
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_______$$$______________________________$$
______$$_$$___________________________$$__$$
____$$_____$$______________________$$$$
____________$$$$$$____________$$$$$$
__________________$$$$$$$$$$$$