by steps
000000 000000
000000
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007f00
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007f7f 007f7f
007f7f
138104 138104
138104
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00ff7f 00ff7f
00ff7f
268409 268409
268409
00ffff 00ffff
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39860e 39860e
39860e
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5f8b17
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728e1c 728e1c
728e1c
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ff7fff ff7fff
ff7fff
859021 859021
859021
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ffff7f
ffffff ffffff
ffffff
989326 989326
989326