by steps
000000 000000
000000
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9492e8
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00007f
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0000ff
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007f7f
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9490e9
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948eeb
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9588f1
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9684f5 9684f5
9684f5
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
9783f7 9783f7
9783f7