by steps
000000 000000
000000
a9657e a9657e
a9657e
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b3688e
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00ff7f
be6b9e be6b9e
be6b9e
00ffff 00ffff
00ffff
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e978de
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ff7f7f
ff7fff ff7fff
ff7fff
f47bee f47bee
f47bee
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff