21,42,123
#
in steps
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000000
2a5477 2a5477
2a5477
00007f 00007f
00007f
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0000ff
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007f7f 007f7f
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244978
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007fff
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1f3f79
00ffff 00ffff
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1a347a 1a347a
1a347a
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152a7b 152a7b
152a7b
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0f1f7c 0f1f7c
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ff7fff ff7fff
ff7fff
050a7e 050a7e
050a7e
ffff00 ffff00
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ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff