by steps
000000 000000
000000
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847474
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00007f
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0000ff
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7d7a7a
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797d7d
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7f7f7f
768181 768181
768181
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728484 728484
728484
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6f8787
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ff7fff
6b8a8a 6b8a8a
6b8a8a
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
688e8e 688e8e
688e8e