by steps
000000 000000
000000
7f7fff 7f7fff
7f7fff
00007f 00007f
00007f
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0000ff
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728ff3 728ff3
728ff3
007fff 007fff
007fff
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669fe8 669fe8
669fe8
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59afdd 59afdd
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4dbfd2
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41cfc6
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34dfbb 34dfbb
34dfbb
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ff7f7f
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ff7fff
28efb0 28efb0
28efb0
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ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
1cffa5 1cffa5
1cffa5