Assembly language: without using the XCHG Instruction, write a program using a sequence of MOV instructions that will exchange the upper and lower...

Assembly language:

without using the XCHG Instruction, write a program using a sequence of MOV instructions that will exchange the upper and lower words in a doubleword variable named three:

 three dword 87654321h

 After the process, the value of the variable three should be 43218765h