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Area = b4 / Screen = 4x4
  1x1   1x2   2x2   3x3   Now
AREA_a3 AREA_a4 AREA_a5 AREA_a6
AREA_b3 AREA_b4 AREA_b5 AREA_b6
AREA_c3 AREA_c4 AREA_c5 AREA_c6
AREA_d3 AREA_d4 AREA_d5 AREA_d6