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Mathematical signal lamp
In fact, this is a binary problem. You can write o as 1 and x as 0.

0000 1 Yes 1

000 10 is 2.

000 1 1 is 3.

The number of numbers represents

1 1 1 1 1

16,8,4,2, 1。

So xoxxo is 0 100 1 of 9.

The maximum number that can be expressed is16+8+4+2+1= 31.

28 is 16+8+4, which means:1100, that is, oooxx.

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