Area = a6 / Screen = 4x4
  1x1   1x2   2x2   3x3   Now
AREA_a5 AREA_a6 AREA_a7 AREA_a8
AREA_b5 AREA_b6 AREA_b7 AREA_b8
AREA_c5 AREA_c6 AREA_c7 AREA_c8