I have bonds in my Traditional IRA that will gain much more in the next few years than the cash in my Roth IRA that's sitting in a money market fund. How might I move the bonds from my Traditional IRA into my Roth IRA and move an equivalent value of cash from my Roth IRA into my Traditional IRA so that it's an even swap and thereby avoid any tax that would otherwise result from withdrawing or converting funds from my Traditional IRA?