by steps
000000 000000
000000
78d728 78d728
78d728
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007f7f 007f7f
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78d628
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78d529
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78d52a 78d52a
78d52a
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78d42b
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78d32b
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78d32c 78d32c
78d32c
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ff7f7f
ff7fff ff7fff
ff7fff
78d22d 78d22d
78d22d
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
79d22e 79d22e
79d22e