sequential (9) set/preset

 https://wodewangzhishime.blogspot.com/2022/03/httpswodewangzhishime_20.html

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Ref: https://wodewangzhishime.blogspot.com/2021/07/go-to-hell.html

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When I input 0 to the preset and 1 to the clear, this flip flops is preset to be Q=1, -Q=0.

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When a register is registered, when no input is input, we must set the status.

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When we register a register, this register can't be at the stage of toggling. . .It must be either Q=1 -Q=0 or Q=0 -Q=1.