The LC3100 does not support subtraction. What is the minimum number of LC3100 instructions required to subtract the contents of one register value from another register? You may assume that the values reside in registers and any other registers may hold any constant values that you may need to support subtraction as long as they are unrelated to the values involved in the subtraction (that is, do not assume that -B is already in a register if you are performing A-B). Do not count any halt instructions.