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Design an expanding opcode instruction set for a computer having 18-bit instructions and the following types...

Design an expanding opcode instruction set for a computer having 18-bit instructions and the following types of instructions. There are 16 CPU registers and 16 bit addresses

a. T1: 63 instructions with three registers referenced

b. T2: 15 instructions with an 8 bit constant value

c. T3: 16 instructions with one register reference

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