Why the RISC instruction sets usually do not contain register to register copy instruction?

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I had this question on my exam and i am confused because as far as i know that

move $t0, $a0               # COPY $A0 TO $T0

in MIPS instruction provides that and MIPS is a RISC processor. Am I missing something?

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lostbard On BEST ANSWER

Move is a pseudo-instruction, and when assembled will really be a different instruction.

For instance

move $t0, $zero gets implemented as addu $t0, $zero, $zero