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B. u(t) =-l(t-1)+2 * l(t-2)-l(t-3)V C. u(t) = l(t-1)-l(t-2)V D. u(t) =-l(t+1)+l(t+2)-l(t+3)V

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B. u(t) =-l(t-1)+2 * l(t-2)-l(t-3)V
C. u(t) = l(t-1)-l(t-2)V
D. u(t) =-l(t+1)+l(t+2)-l(t+3)V

AA

BB

CC

DD

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