by steps
000000 000000
000000
8c7183 8c7183
8c7183
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0000ff
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007f7f 007f7f
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007fff
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00ff7f
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7b8270
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728a67 728a67
728a67
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619b55 619b55
619b55
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59a44c 59a44c
59a44c
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ff7f7f
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50ac43 50ac43
50ac43
ffff00 ffff00
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ffffff ffffff
ffffff
48b53a 48b53a
48b53a