21,45,75
#
in steps
000000 000000
000000
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00007f
0000ff 0000ff
0000ff
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007f00
007f7f 007f7f
007f7f
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0a1665
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102258 102258
102258
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152d4b 152d4b
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254f24 254f24
254f24
ffff00 ffff00
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ffff7f ffff7f
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ffffff ffffff
ffffff
2b5b17 2b5b17
2b5b17