by steps
000000 000000
000000
6f849e 6f849e
6f849e
00007f 00007f
00007f
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0000ff
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70849e 70849e
70849e
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71849f 71849f
71849f
00ffff 00ffff
00ffff
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72849f 72849f
72849f
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7584a1 7584a1
7584a1
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ff7f7f
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7684a2 7684a2
7684a2
ffff00 ffff00
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ffff7f
ffffff ffffff
ffffff
7784a3 7784a3
7784a3