by steps
000000 000000
000000
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00007f
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e5e21f
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cbc63f cbc63f
cbc63f
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b1aa5e b1aa5e
b1aa5e
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7f7f7f
978e7e 978e7e
978e7e
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7d719e 7d719e
7d719e
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6355bd 6355bd
6355bd
ff7f00 ff7f00
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ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
4939dd 4939dd
4939dd
ffff7f ffff7f
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ffffff ffffff
ffffff
2f1dfd 2f1dfd
2f1dfd