Area = a9 / Screen = 4x4
  1x1   1x2   2x2   3x3   Now
AREA_a8 AREA_a9 AREA_a10 AREA_a11
AREA_b8 AREA_b9 AREA_b10 AREA_b11
AREA_c8 AREA_c9 AREA_c10 AREA_c11