21,0,218
#
in steps
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000000
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0000ff
00007f 00007f
00007f
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007f00
007f7f 007f7f
007f7f
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0f00e3
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7f7f7f
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1500da
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2400bf 2400bf
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ffff7f ffff7f
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ffffff ffffff
ffffff
2a00b6 2a00b6
2a00b6