Effective signal circuit for weightlifting

As long as two of the three weightlifting judges press the valid button, the weightlifting will be considered successful. The circuit is shown in the figure (effective circuit). In the figure, SBi~SB3 are the control buttons for the referee to send effective signals when the athlete lifts the barbell
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    Set up another invalid circuit, which is exactly the same as the effective circuit , except that the indicator light is red.