by steps
000000 000000
000000
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a77518
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a77519 a77519
a77519
007fff 007fff
007fff
00ff00 00ff00
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00ff7f
a8761a a8761a
a8761a
00ffff 00ffff
00ffff
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7f007f
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a9781d a9781d
a9781d
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a9781e a9781e
a9781e
ff0000 ff0000
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aa791f
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ff7f7f ff7f7f
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ff7fff ff7fff
ff7fff
aa7a20 aa7a20
aa7a20
ffff00 ffff00
ffff00
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ffffff ffffff
ffffff
ab7b22 ab7b22
ab7b22