by steps
000000 000000
000000
647474 647474
647474
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00007f
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0000ff
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007f7f
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6b7a7a
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00ff7f
728181 728181
728181
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798787
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818e8e
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889494
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ff7f7f
ff7fff ff7fff
ff7fff
96a1a1 96a1a1
96a1a1
ffff00 ffff00
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ffff7f
ffffff ffffff
ffffff
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9ea8a8