by steps
000000 000000
000000
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00007f
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0000ff
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007f00
007f7f 007f7f
007f7f
121082 121082
121082
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00ff7f
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252086
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383189
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5e5191
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847298 847298
847298
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
97839c 97839c
97839c