by steps
000000 000000
000000
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00007f
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0000ff
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007f00
007f7f 007f7f
007f7f
12118e 12118e
12118e
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00ff00
00ff7f 00ff7f
00ff7f
25239e 25239e
25239e
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3834ad 3834ad
3834ad
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5e58cc
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ff7fff ff7fff
ff7fff
847beb 847beb
847beb
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ffff7f
ffffff ffffff
ffffff
978dfb 978dfb
978dfb