by steps
000000 000000
000000
90830c 90830c
90830c
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0000ff
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007f7f 007f7f
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91830b 91830b
91830b
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00ff7f 00ff7f
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92830b 92830b
92830b
00ffff 00ffff
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93830b
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94830b 94830b
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95830b 95830b
95830b
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96830b 96830b
96830b
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ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
97830b 97830b
97830b
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
99830b 99830b
99830b