⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ............8...........................................................10..........................................................................12..........................18......19........................................................21..........................................23.......................................................................23......................................................................27.......................30..............................................31.......................34..............................................36...................39.............................................................41 photovoltaic ⚫ ⚫ ⚫ ⚫ ⚫