156th day of 2016.
Adding more layers and details to any design would eventually make it unique enough to be original. I have expanded on how the Elements mix together to either come to a secondary element or back to one of the core element.
Further research prompt me to consider also the division of the Powers by their 'state'...? Example, physical state, would be the most common solid, liquid and gas. If you master solid, you can manipulate all solid stuff, instead of divide it by wood, metal or earth. Those are all solid.