by steps
000000 000000
000000
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f40171
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00007f
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0000ff
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f40871
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007fff
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00ff7f
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f51072
00ffff 00ffff
00ffff
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f51873
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7fffff
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f72875
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f73076
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ff7f7f
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ff7fff
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f83877
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ffff00
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ffff7f
ffffff ffffff
ffffff
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f94078