#888888 on #000000
#000000 on #888888
#888888 on #ffffff
#ffffff on #888888
#ff4422 on #000000
#000000 on #ff4422
#ff4422 on #ffffff
#ffffff on #ff4422
#44bb44 on #000000
#000000 on #44bb44
#44bb44 on #ffffff
#ffffff on #44bb44
#9999ff on #000000
#000000 on #9999ff
#9999ff on #ffffff
#ffffff on #9999ff