21,3,0
#
in steps
000000 000000
000000
00007f 00007f
00007f
0000ff 0000ff
0000ff
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007f00
007f7f 007f7f
007f7f
050000 050000
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00ff00
00ff7f 00ff7f
00ff7f
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0a0100
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100200 100200
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7f7f00
7f7f7f 7f7f7f
7f7f7f
150300 150300
150300
7f7fff 7f7fff
7f7fff
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7fff7f 7fff7f
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7fffff
1a0400 1a0400
1a0400
ff0000 ff0000
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ff007f
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200500 200500
200500
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ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
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250600 250600
250600
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
2b0700 2b0700
2b0700