oooooo------oooooo------------oooooo------oooooo------------------------
------oooooo------oooooo------------------------oooooo------oooooo------
------------------------oooooo------oooooo------------oooooo------oooooo
6am-->noon->6pm-->midn->6am-->noon->6pm-->midn->6am-->noon->6pm-->midn->
6 hours on,
6 hours off,
6 hours on,
12 hours off.
6 hours on,
6 hours off,
6 hours on,
24 hours off.
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