19. 19. Given 16-bit instructions, is it possible to use expanding opcodes to allow the following to be encoded assuming we have a total of 32 registers? If so, show the encoding. If not, explain why is it not possible.

1. 60 instructions with two register operands 2. 30 instructions with one register operand 3. 3 instructions with one 10-bit address 4. 26 instructions with zero operands