Using a 4-bit counter with parallel load as in Fig. 2-11 and a 4-bit adder as in Fig. 4-6, draw a block diagram that shows how to implement the following statements: 

x    :R1←R1 + R2     Add R2 to R1

x'y : R1←R1 + 1      Increment R1

where R1 is a counter with parallel load and R2 is a 4-bit register. 

Fig. 2-11

Fig. 4-6

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