### A good answer might be:

    or   $25,$25,$11    # move opcode into target register

Alternative:

    or   $25,$11,$0     # move opcode into target register

# Source Register

Now move the bit pattern for the source register $9 into the correct field. Register $12 contains the pattern in its right-most bits, like in the left table. The pattern should be in bits 25...21 of register $25.

31....26 | 25...21 | 20...16 | 15............................0
000000 | 00000 | 00000 | 0000 0000 0000 1001

`ori $8,$9,0x004A`
31....26 | 25...21 | 20...16 | 15...................0
0xD | s | d | unsigned const
0xD | 0x9 | 0x8 | 0x004A

The same method can be used for this as for the opcode. There is a slight problem: the opcode already in $25 must not be erased.

### QUESTION 19:

Fill in the next part of the program

    sll   $12,$12,_____      # left shift s by _____ places
    or    $25,_____,_____    # move s into target register