$1.$ The LC$-3$ does not have an opcode for the logical function OR$.$ That is$,$ there is no instruction in the LC$-3$ ISA that performs the OR operation. However, we can write a sequence of instructions to implement the OR operation. The following four$-$instruction sequence performs the OR of the contents of register $1$ and register $2$ and puts the result in register $3.$ Fill in the two missing instructions so that the four$-$instruction sequence will do the job.

$$

$(1)$: $1001100001111111$

$(2)$:

$(3)$: $0101110100000101$

$(4)$: