by steps
000000 000000
000000
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8a7308 8a7308
8a7308
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728a09 728a09
728a09
ff7f00 ff7f00
ff7f00
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ff7fff ff7fff
ff7fff
5ba10b 5ba10b
5ba10b
ffff00 ffff00
ffff00
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ffffff ffffff
ffffff
44b80d 44b80d
44b80d