plot (sgn(sin(2*pi*2500*t) + sin(2*pi*3*2500*t) + sin(2*pi*9*2500*t))), t from 0 to 4e-4plot (sgn(sin(2*pi*2500*t) + sin(2*pi*3*2500*t) + sin(2*pi*9*2500*t))), t from 0 to 4e-4

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