Area = a5 / Screen = 4x4
  1x1   1x2   2x2   3x3   Now
AREA_a4 AREA_a5 AREA_a6 AREA_a7
AREA_b4 AREA_b5 AREA_b6 AREA_b7
AREA_c4 AREA_c5 AREA_c6 AREA_c7