Figure P8.15-1 shows two sequences x1[n] and x2[n]. The value of x2[n] at time n = 3 is...

Figure P8.15-1 shows two sequences x₁[n] and x₂[n]. The value of x₂[n] at time n = 3 is not known, but is shown as a variable a. Figure P8.15-2 shows y[n], the four-point circular convolution of x₁[n] and x₂[n]. Based on the graph of y[n], can you specify a uniquely? If so, what is a? If not, give two possible values of a that would yield the sequence y[n] as shown.