by steps
000000 000000
000000
858b52 858b52
858b52
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00007f
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0000ff
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808a53
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007fff
00ff00 00ff00
00ff00
00ff7f 00ff7f
00ff7f
7b8a55 7b8a55
7b8a55
00ffff 00ffff
00ffff
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7f007f
768956 768956
768956
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728958 728958
728958
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7fffff
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6d8859
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68885b 68885b
68885b
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ff7f7f
ff7fff ff7fff
ff7fff
63875c 63875c
63875c
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
5f875e 5f875e
5f875e