by steps
000000 000000
000000
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7f7f7f
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00007f
0000ff 0000ff
0000ff
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72838e 72838e
72838e
007fff 007fff
007fff
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66879e 66879e
66879e
00ffff 00ffff
00ffff
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2a9ceb 2a9ceb
2a9ceb
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ffff7f
ffffff ffffff
ffffff
1ea1fb 1ea1fb
1ea1fb