by steps
000000 000000
000000
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0000ff
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00007f
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007f7f 007f7f
007f7f
1211f8 1211f8
1211f8
007fff 007fff
007fff
00ff00 00ff00
00ff00
00ff7f 00ff7f
00ff7f
2523f1 2523f1
2523f1
00ffff 00ffff
00ffff
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3835ea 3835ea
3835ea
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4b47e4
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5e59dd
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716bd6
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ff7fff
847dcf 847dcf
847dcf
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
978fc9 978fc9
978fc9