Suppose the opcode of an MIPS instruction is $0$ in decimal, the funct is $011001$ in binary, and the rest of the machine code is cd$800$ in hexadecimal $($from high$-$order bit to low$-$order bit$).$ What is the instruction? When showing the registers, use names $($e$.$g$.$ $t$0,$ $s$2)$ instead of indices $($e$.$g $$8,$ $$17).$