by steps
000000 000000
000000
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797a31
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00007f
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0000ff
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787b32
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007fff
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00ff7f
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777c34
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757e38
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747f39
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73803b
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ff7fff
72813d 72813d
72813d
ffff00 ffff00
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ffffff ffffff
ffffff
71833f 71833f
71833f