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A digital computer has a common bus system for 16 register of 32 bits each. The bus is constructed using multiplexers.

The output of four registers R0, R1, R2 and R3 are connected through 4 to 1 line multiplexer to the inputs of a fifth register, R5. Each register is eight bit long. The required transfer are dictated by four timing variables T0 through T3 as follows: