Area = a10 / Screen = 4x4
  1x1   1x2   2x2   3x3   Now
AREA_a9 AREA_a10 AREA_a11 AREA_a12
AREA_b9 AREA_b10 AREA_b11 AREA_b12
AREA_c9 AREA_c10 AREA_c11 AREA_c12