You are hired as a consultant by the Faulty Networks Corporation to fix a problem that they are having with a proprietary transport layer protocol, FNC-TP. FNC-TP uses a Go-Back-4 ARQ scheme. The sequence number field and the acknowledgement field of the FNC-TP header are each two bits in length. Draw a diagram (similar to Figure 3.22 in Kurose and Ross) that demonstrates that FNC-TP may not always work properly.